1
2
  -2022
  
  III
 :    : 100
:    ,             
          
-
1.    x        (TC)     
:
C = 60 - 12x + 2x2.   (AC)       (x)    
           AC    
, AC
= MC          (MC) 
2.             :
u = xy2 - 3x - 5y        , fxy = fyx
-
3.    ,       p = 10 - x - x2  p = x - 2
,       (CS)    (PS)   
4.     :
     - www.onlinedoctranslator.com
2
2
() 𝒙
𝟐
𝒙
ⅆ𝒙
(ii) 𝒍𝒐𝒈 𝒙 ⅆ𝒙
-
5.            
6.     :
3 4 2
1 0 1
5 6 7
-
7. (a)        
(8)            Z = 2x_{1} -
3x_{2}
   :
4x_{1} + 5x_{2} <= 40
x_{1} + 3x_{2} <= 12
x_{1} - x_{2} >= 2
x_{1} >= 4
x_{1}, x_{2} >= 0
3
2
8.        -    -
   :





0.20
0.05

0.20
0.25
       500  200     
 
4
2
  -2022
  
  III
 :    : 100
:    ,             
          
-
1.    x        (TC)     
:
C = 60 - 12x + 2x2.   (AC)       (x)    
           AC    
, AC
= MC          (MC) 
1. :    :      : C = 60 - 12x +
2x²  C  ,  x  
         -      
   :
60:    ,       ,  
-12x:    ,         
2x²:             ,  
 
2.   ()         
         ,     x  
 :
 =  / x  = (60 - 12x + 2x²) / x  = 60/x - 12 + 2x
5
2
         -      

3.     
:       AC    
 ,         x   AC     
  :
()/dx = -60/x² + 2 = 0
     :-60/x² = -2 60/x² = 2 x² = 30 x = √30 ≈ 5.48
        5.48        

4.   =    MC: ,        ,
  (AC)   (MC)  
 ,       MC     :
 = ()/ = -12 + 4x
x = √30 : AC = 60/√30 - 12 + 2√30 ≈ 10.95 MC = -12 + 4√30 ≈ 10.95
    ,  
 AC  MC    ,    
 
5.         (MC)  :    
MC   ,  MC           :
()/ = 4 = 0
     ,     MC      
 ,        x        ,  
  0
x = 0 , MC = -12,        
,           :
   :    ,       
             
          ,     
     
 ():TC  (C = 60 - 12x + 2x²)     x    
                  
:
  (60)        
6
2
 -12x         ,    
   
, 2x²        ,       , 
 ,           
  ():  ( = 60/x - 12 + 2x)       
              
    -   :
   ,      ,  AC  
   
-   ,            
  
 ,       AC   
AC     (x ≈ 5.48 )           
     " "   
  ():MC  (MC = -12 + 4x)        
               :
MC      (-12  x = 0),        
         
- x  , MC    
MC        (x = 0  ),      
      
     :    AC      AC = MC  ,
               :
 AC   ,  MC, AC     (   )
 AC   ,  MC  AC     (    )
     AC     , MC, AC    
                
   MC < AC ,           MC > AC
,        
 :
  :x ≈ 5.48          
            
7
2
      AC  MC      
    ,       AC     ,
          MC  
   :         (
  ) ,     (   )   
      
              ,
                
  
  : MC              
          MC   ,    
    
  :
 :            
        
  :       
             
- :         ,   
  -      
   ,           
       
 : ,        
 ,         
   ,           
         ,     ,
              
              
  ,         
8
2
2.             :
u = xy2 - 3x - 5y        , fxy = fyx
: -  :
-           ,       
    ,     : x  y.
a) x     (∂u/∂x  fx):     ,  y      x
    
∂u/∂x = y² - 3
  :
x   xy²   (y     )
-3x   -3 
 -5y      x           
 
b) y     (∂u/∂y  fy): ,  x      y   

∂u/∂y = 2xy - 5
  :
y   xy²   2xy  (x     )
-3x       y          
-5y   -5 
2. -  :
,  -      -     
  
a) x       (∂²u/∂x²  fxx):  x   fx   
 
∂²u/∂x² = 0
    x  - 3   0  (y       )
b) y   
   (∂²u/∂y²  fyy): fy  y    
    
∂²u/∂y² = 2x
9
2
    y   2xy - 5   2x  (x       )
)    (∂²u/∂x∂y  fxy):  x  ,   y   
   
fx = y² - 3   ,   y     :
∂²u/∂x∂y = 2y
)   (∂²u/y∂x  fyx):   y  ,   x   
   
fy = 2xy - 5    ,   x     :
∂²u/∂y∂x = 2y
3.     fxy = fyx:
       :
fxy = ∂²u/∂x∂y = 2y fy = ∂²u/∂y∂ = 2y
,         fxy = fyx
,                :
   :
                
                 
             
  u = xy² - 3x - 5y ,    , x  y ,  -   
             :
1. ∂u/∂x = y² - 3       y     x       u
          y     
2. ∂u/∂y = 2xy - 5       x     y       u
  2xy         x  y    
-  :
-                
          
1. ∂²u/∂x² = 0     x          x   
 , x-    
10
2
2. ∂²u/∂y² = 2x     y        ,    x 
  - x  ,  y       

  :
   fxy  fyx               
       ,  2y   ,   :
1. - y  ,  x         
2. - x  ,  y        
3.         (2)  
fxy = fyx  :
   (fxy = fyx)           
,               
           
    :
1.      :         
   
2.                 
    
3.                 

- :
           :
1. :            
        ,     
 
2.  :           
  ,           
3. :  ,         
           
4.  :  ,         ,
        
11
2
  :
  u = xy² - 3x - 5y  -           (x,
y, u) x  y      u   
 xy²       y        ,  x 
         
-3x  x        

-5y  y        

       ,            
   
:
u = xy² - 3x - 5y     ,         
                ,
       
  :
∂u/∂x = y² - 3
∂u/∂y = 2xy - 5
∂²u/∂x² = 0
∂²u/∂y² = 2x
∂²u/∂x∂y = ∂²u/∂y∂x = 2y
          ,         
x  y          (fxy = fyx)  
               
              , ,
                
                
             

12
2
-
3.    ,       p = 10 - x - x2  p = x - 2
,       (CS)    (PS)   
: 2:     ,      ,  
        :
10 - x - x² = x - 2
,     : 10 - x - x² = x - 2 12 = 2x + x² x² + 2x - 12 = 0
              : x = [-b ± √(b² -
4ac)] / 2a
 a = 1, b = 2,  c = -12
x = [-2 ± √(4 - 4(1)(-12))] / 2(1) x = [-2 ± √52] / 2 x = [-2 ± 7.211] / 2
     : x₁ = (-2 + 7.211) / 2 = 2.6055 x₂ = (-2 - 7.211) / 2 = -4.6055
     ,   x = 2.6055 (4    ) 
 
 3:                 
        :
 = 10 - x - x²  = 10 - 2.6055 - (2.6055)²  = 10 - 2.6055 - 6.7886  = 0.6059
    0.6059 
 4:   ()          
        ,     0      
             
 = ∫[0  2.6055] (10 - x - x²) dx - (0.6059 * 2.6055)
    : ∫(10 - x - x²) dx = 10x - x²/2 - x³/3
0  2.6055  : CS = [10(2.6055) - (2.6055)²/2 - (2.6055)³/3] - [10(0) - 0²/2 - 0³/3] -
(0.6059 * 2.6055) CS = [26.055 - 3.3943 - 5.8924] - 0 - 1.5787 CS = 16.7683 - 1.5787 CS =
15.1896
 5:  (PS)           
         0          
            
 = (0.6059 * 2.6055) - ∫[0  2.6055] (x - 2) dx
13
2
   : ∫(x - 2) dx = x²/2 - 2x
0  2.6055  : PS = (0.6059 * 2.6055) - [(2.6055)²/2 - 2(2.6055)] - [0²/2 - 2(0)] PS =
1.5787 - [3.3943 - 5.211] PS = 1.5787 - (-1.8167) PS = 3.3954
       ,         
         
    :
                  
                 
       
1. :       -      
      , -   ,     
          

  ,   p = 10 - x - x²      ,     
        x       
 -   ,    ,      
2. :       -     
       , -   ,    
            
 
  ,   p = x - 2     ,    
   x         -   ,   ,
      
3. :              ,
           ,       
 ,       2.6055      
0.6059
   :
               
                  
                    

  ,                
    ,       15.1896 
       ,         $10 
    ,       $7    $3   
14
2
       -        
   
    :
1.               
  
2.              
     
3.             
      
   :
               
                  
                 

  ,               
      ,       3.3954    
       ,          
   $5         ,    $8  $3   
         -       
        
     :
1.                 

2.               
    
3.              
       
      :
           
                  
 ,   15.1896 + 3.3954 = 18.5850 
15
2
        :
1.   :        
       (,       )
           " "  
2.             
       ,      
         ,     
             
3.  :       ,  
            
4.     :      
  ,             
      
   ,           
             
              -   
           ,     
                 
    
 ,        ,      
      -     , 
              , 
,              
 
4.     :
() 𝒙
𝟐
𝒙
ⅆ𝒙
(ii) 𝒍𝒐𝒈 𝒙 ⅆ𝒙
:   :
               ,   
                
            ,    
16
2
     ,   :
1.   (     )
2.   
3.   
4.  
5.  
      ,         

  :
               
  ,           ,   
     
     :
∫u dv = uv - ∫v du
 u  v, x   ,  du  dv  
,       :
 (i):∫x^2 ^ 
        : x^2  e^x      
     -- :
1:u  dv   u               ,
 dv             
  u = x^2 (      )   dv = e^x dx (
   )
 :du  v  du = 2x dx (x^2  ) v = e^x (e^x  )
 3:       x^2 e^x dx = x^2 e^x - ∫e^x (2x dx)
 4:        : x^2 e^x - 2∫xe^x dx
∫xe^x dx             
  u = x   dv = e^x dx
 =   = ^
17
2
∫xe^x dx = xe^x - ∫e^x dx = xe^x - e^x + C
 5:           x^2 e^x dx = x^2 e^x -
2(xe^x - e^x + C) = x^2 e^x - 2x e^x + 2e^x + C
 6:       x^2 e^x dx = e^x (x^2 - 2x + 2) + C
         C         
         
 (ii): ∫log x dx
              
    ,       
1: ∫log x dx = ∫ln x dx    (log  ln      
         )
 : u  dv    u = ln x   dv = dx
 3:du  v   du = 1/x dx (ln x  ) v = x (dx  )
 4:      ln x dx = x ln x - ∫x (1/x dx) = x ln x - ∫dx = x ln x - x +
C
        
  :
             :
∫x^2 e^x dx  : , e^x (x^2 - 2x + 2) + C,        
  e^x          x^2     ,
   -2x  +2        -    , 
   x    -  ""
         : d/dx [e^x (x^2 - 2x + 2)] = e^x (x^2 -
2x + 2) + e^x (2x - 2) = e^xx^2
∫ln x dx  : , x ln x - x + C,     x ln x    
   -x       dx      
     :   y = ln x    ,   1  x  
        x ln x - x + C    x      
         : d/dx [x ln x - x] = ln x + x(1/x) - 1 = ln
x
18
2
 :
         :
1.  : e^x          ,
              
         
2. :          ,  
            
        
3. :           
             
      
4.   ,    (e^x  )   
         
5. : ,     ,     
             
   
   :
            ,    
     :
1.  :          
     , ∫x^n dx = (x^(n+1))/(n+1) + C n ≠ -1  
2. :               
    , ∫cos(x^2) * 2x dx  u = x^2    
 
3.  :             
              

4.  :         
            
  
   :
1.  :            
      ,        
19
2
2.             ,
 u  dv               
     
3.    -,        
    
4.    :       (C)   
5.   :           
    ,     
6.      :     , 
              
       
:
             
  , ∫x^2 e^x dx  log x dx,         :
       
   -- ,          
                
   ,            
 ,                
     -     ,   
            ,  
 -     -          

-        ,       
                 
   
-
5.            
:  
20
2
           ,  
              
          , , , 
             ,   
        
       (, A)    ,       
aija_{ij}aij      ,  iii  jjj         
               
   ,  m× \times nm×   m   n  
  
    ,             
 :
1.  :            
:
  1×31 \times 31×3          
2.  :             
:
  3×13 \times          
3.  :            
  :
  22×2  
4.  :   ,  (        ) 
         :
21
2
  3×33  
5.  :            
1    :
      1    
6.   ( ):          
    :
      ,          
7.  :             
 ,              
 :
      S=ST   
8. -    -      
    , , AT=−AA^T = -AAT=−A.   :
22
2
  -
9.  :             
         :
o   :      
o
o   :         :
10.   - :
o  :          ,
   
o - :   -     
 ,    
11.     AAA       
      , , A×AT=IA \times A^T = IA×AT=I.
  
       ,   :
1.   :           
    
2.  :       (   )  
 
3.    AAA  BBB        AAA  
  BBB       
4.   : AAA        
  
5. :               
                -

23
2
6.  :  AAA  ,  A−1A^{-1}A−1    ,   
  A×A−1=I.
      ,      
                
 ,             
         
6.      :
3 4 2
1 0 1
5 6 7
:3x3            ,    
    ,             
 :
   ?
 A  ,  A−1      ,       A  
        III         1
     0 3x3   ,   :
  , AA−1=A−1A=I
24
2
3x3       
1.         :      ,
           
 3x3  AAA  , 
      :
          
2.        : AAA :
 a 3, b=4b = c=2c, d=1, e=0, f=, g=5g = 5g=5,        :
   −14-14−14 ,         ,  
 ,            
3.             2x2
               
25
2
  ,      (, 3)        , 
        ,      :
    :
07−16=−60
 ,  3   −6-6−6
                  

 4 ( ,  )   :
 2 ( ,  )   :
 1 (
 ,  )   :
26
2
 0 (
 ,
 )   :
 1 (
 ,  )   :
 5 ( ,  )   :
 6 ( ,
 )   :
 7 ( ,  )   :
27
2
 ,    :
4.     :   ,      
          :
 ,    :
5.  ( )     :       
       ,       
       :
6.    :           
      −14-14−14 ,     
   −14-14−14    :
28
2
   :
 ,      :

         ,   AAA    A−1A^{-1}A−1
        ,    
29
2
-
7. (a)        
:  ()           
               
      ,   ,         
                
      
          :
1. 
                
       ,       $20 
  ,     5    $100   ,  10 
  $200              
 ,               
 ,   ,     -     
2. 
                
        ,       , 
           ,       
           
3.  ()
               ,  LP  
     ,        
           ,    
12.5         ,    ,    
  ,    ,         
  
4. 
             (   ,
 ,    )          
 ,  , ,      -   
       ,         
 
30
2
5. -
          -  ,    
              
     ,         ,     

6.  
                   
        ,       
,         
 :
      , X  Y         
        (  ,  , )  
                  
         
   ,   :
 :X  Y    
:,      
      X  Y  
  X  Y             
             
     ,   ,      
            
              
       ,      LP 
 ,      ,     , 
              
 
31
2
(8)            Z = 2x_{1} -
3x_{2}
   :
4x_{1} + 5x_{2} <= 40
x_{1} + 3x_{2} <= 12
x_{1} - x_{2} >= 2
x_{1} >= 4
x_{1}, x_{2} >= 0
:          
  
  Z = 2x₁ - 3x₂
  :
1. 4x₁ + 5x₂ ≤ 40
2. x₁ + 3x₂ ≤ 12
3. x₁ - x₂ ≥ 2
4. x₁ ≥ 4
5. x₁, x₂ ≥ 0
-- 
1.   
   ,            :
)  :
 = 2x₁ - 3x₂
        
x₁      2     
x₂      3    
)  :
         
32
2
  -   5  
        
2.       
        :
1. 4x₁ + 5x₂ ≤ 40
2. x₁ + 3x₂ ≤ 12
3. x₁ - x₂ ≥ 2 → x₁ - x₂ - 2 ≥ 0
4. x₁ ≥ 4
5. x₁ ≥ 0  x₂ ≥ 0
3.      

    0    
         

 :
1. 4x₁ + 5x₂ = 40  
o  x₁ = 0:5x₂ = 40 → x₂ = 8
o  x₂ = 0:4x₁ = 40 → x₁ = 10
o : (0, 8)  (10, 0)
2. x₁ + 3x₂ = 12  
o  x₁ = 0: 3x₂ = 12 → x₂ = 4
o  x₂ = 0: x₁ = 
o : (0, 4)  (12, 0)
3. x₁ - x₂ = 2  
o  x₁ = 0:-x₂ = 2 → x₂ = -2 (   )
o  x₂ = 0: x₁ = 2
o : (2, 0)    (4, 2)
4. x₁ = 4  
o  x₁ = 4     
4.   
33
2
       ,             
         :
4x₁ + 5x₂  
   = 40
x₁ + 3x₂  
   = 12
   x₁ - x₂ = 2
x₁  
   = 4
  (-   )
5.     

     ,             

    :
a) x₁ = 4  x₁ - x₂ = 2
4 - x₂ = 2
x₂ = 2

:(4, 2)
b) x₁ = 4  x₁ + 3x₂ = 12
4 + 3x₂ = 12
3x₂ = 8
x₂ = 2.67

:(4, 2.67)
c) x₁ = 4  4x₁ + 5x₂ = 40
16 + 5x₂ = 40
5x₂ = 24
x₂ = 4.8
: (4, 4.8)
6.   
  
           ,    
:
1. (4, 2) [x₁ = 4  x₁ - x₂ = 2   ]
34
2
2. (4, 2.67) [x₁ = 4  x₁ + 3x₂ = 12   ]
7.    
   
 Z = 2x₁ - 3x₂   :
1. (4, 2) : = 2(4) - 3(2)  = 8 - 6  = 2
2. (4, 2.67) : = 2(4) - 3(2.67)  = 8 - 8.01  = -0.01
8.   
  Z     ,    
    Z    
 :
(4, 2) : = 2
(4, 2.67) : = -0.01
,    :
x₁ = 4
x₂ = 2
 Z = 2
  
         :
1.  :
o x₁ = 4      1  4   
o x₂ = 2:      2  2   
o  Z = 2:        
2.  :
o x₁      2     
o x₂      3    
o   :
x₁  : 2 × 4 = 8 
x₂   : 3 × 2 = 6 
 : 8 - 6 = 2 
35
2
3.  :
o   (4, 2)       :
x₁ = 4 (  )
x₁ - x₂ = 2 ( )
o         
o           
  
           :
1. 4x₁ + 5x₂ ≤ 40
o 4(4) + 5(2) = 16 + 10 = 26 ≤ 40
2. x₁ + 3x₂ ≤ 12
o 4 + 3(2) = 4 + 6 = 10 ≤ 12
3. x₁ - x₂ ≥ 2
o 4 - 2 = 2 ≥ 2
4. x₁ ≥ 4
o 4 ≥ 4
5. x₁, x₂ ≥ 0
o 4 ≥ 0  2 ≥ 0
  
      ,          
  :
1. x₁  :
o  x₁ = 4    ,        

o x₁              
2. x₂  :
o x₂   2       
o ,            
36
2
 
           :
1.  :
o x₁          
  
o x₂              
   
2.   :
o        :
  (4x₁ + 5x₂ ≤ 40)
  (x₁ + 3x₂ ≤ 12)
  (x₁ - x₂ ≥ 2)
   (x₁ ≥ 4)

     :
  x₁ = 4, x₂ = 2 
 Z = 2      
        
        :
o x₁     
o x₂     
o      
37
2
   
8.        -    -
   :





0.20
0.05

0.20
0.25
       500  200     
 
:   
 ,          :
    :   
                
   
         :
o   500     
o   200      
     (0.20, 0.05, 0.20, 0.25)  "- "  "
"           :
    :
1       0.20 
1         0.20 
    :
1       0.05 
1         0.25 
2.     
       :
    ()     
38
2
                
 
3.   
  :
   = X₁
   = X₂
     :
1.   : X₁ = 0.20X₁ + 0.05X₂ + 500 (  :   =    
  +       +  )
2.   : X₂= 0.20X₁ + 0.25X₂ + 200 (  :   =  
    +       +  )
4.       
     :
 1: X₁ - 0.20X₁ - 0.05X₂ = 500 0.80X₁ - 0.05X₂ = 500
 2:-0.20X₁ + X₂ - 0.25X₂ = 200 -0.20X₁ + 0.75X₂ = 200
  : 0.80X₁ - 0.05X₂ = 500 ( 1) -0.20X₁ + 0.75X₂ = 200 ( 2)
       :
 1  4   :3.20X₁ - 0.20X₂ = 2000
 2  1   :-0.20X₁ + 0.75X₂ = 200
   : 3X₁ + 0.55X₂ = 2200
 2 :0.75X₂ = 200 + 0.20X₁ X₂ = (200 + 0.20X₁)/0.75 X₂ = 266.67 + 0.267X₁
  1   : 0.80X₁ - 0.05(266.67 + 0.267X₁) = 500 0.80X₁ - 13.33 -
0.013X₁ = 500 0.787X₁ = 513.33 X₁ = 652.26
 X₂       :X₂ = 266.67 + 0.267(652.26) X₂ = 266.67 +
174.15 X₂ = 440.82
5.  
     :
 (X₁)= 652.26  (2    )
 (X₂)= 440.82  (2    )
39
2
6. 
                 
  :
  : 0.20(652.26) + 0.05(440.82) + 500 = 652.26 130.45 + 22.04 + 500 = 652.49
(    )
  : 0.20(652.26) + 0.25(440.82) + 200 = 440.82 130.45 + 110.21 + 200 = 440.66
(    )
7.   
     :
   (652.26 ):
500      
130.45  (652.26  20%)      
22.04  (440.82  5%)    
   (440.82 ):
200      
130.45  (652.26  20%)    
110.21  (440.82  25%)     
8.   
       :
1.      (500 )     ,    652.26
       :
o             
 
o           
o        
2.   (200 )        ,  440.82
       :
o             

o            
40
2
o        
3.  
        :
1.  :
o            
o      
o    
2.  :
o            
o             
o        
3.   :
o      
o         
o      
4.    
         :
1.  :
o            
o       
o      
2. - :
o       ,   
o       
o       
3.   :
o            
41
2
o        
o       
4.    
    ,       :
1.  :
o       
o      
o       
2. :
o       
o    
o      
3. - :
o     
o    
o       
4. 
            :
   500 
   200 
      :
   652.26 
   440.82 
                
                 
                 
   ,  -       ,  
    ,            
42
2
          ,    
             
:             ( )      
         ,              