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miércoles, 15 de octubre de 2014

Examen Parcial

Examen Parcial  

1.Demuestre algebraica mente  que todas las soluciones básicas de      la siguiente P.L sea no factibles 
    
   Maximizar Z = x1+3x2
    Sujeto  a :
     x1+x2   < o = 2
    -x1+x2   < o = 4
       x1,x2   >      0
    
Variables no basicas
Variables basicas
Solucion basica
Punto de esquina solucion
Factible
Valor objetivo
(x1,x2)
(s1,s2)
(2,4)
A
Si
0
(x1,s1)
(s2,s2)
(2,2)
B
Si
6
(x1,s2)
(x2,s1)
(4,-2)
C
No
---
(x2,s1)
(x1,s2)
(2,0)
D
Si
2
(x2,s2)
(x1,s2)
(-4,6)
---
No
---
(s1,s2)
(x1,x2)
(-1,3)
---
No
---






2. Considere el Problema 
    Minimizar Z = 4x1-8x2+3x3
    Sujeto a :
    x1+x2+x3             = 7
    2x1-5x2+x3    > o = 10
    x1,x2,x3          > o = 0 




3. Considere el Problema 
    Maximizar  Z = 16x1+15x2
    Sujeto a :
    40x1+31x2 < o = 124
    -x1+x2       < o = 1
     x1              < o = 3
     x1,x2         > o  = 0

   Z = 16x1 + 15x2 + 0s1 + 0s2 + 0s3

  40x1 + 31x2 + s1 = 124
  -x1 + x2 + s2 = 1
   x1 + s3 = 3


  • Ahora obtendremos la fila de pivote:


Básica
Z
x1
x2
s1
s2
s3
Solución
Z
1
-16
-15
0
0
0
0
S1
0
40
31
1
0
0
124
S2
0
-1
1
0
1
0
1
S3
0
1
0
0
0
1
3

  • Obtendremos la fila de pivote:


Básica
X1
Solución
Relación
s1
40
124
124/40 = 3.1
S2
-1
1
-----
S3
1
3
3/1 = 3




Básica
Z
x1
x2
s1
s2
s3
Solución
Z
1
0
-15
0
0
16
48
S1
0
0
31
1
0
-40
4
S2
0
0
1
0
1
1
4
x1
0
1
0
0
0
1
3

  • Hallando fila que  se reemplazara

Básica
x2
Solución
Relación
S1
31
4
4/31=0.12
S2
1
4
4/1= 4
X1
0
3
No


  • Llenando una nueva tabla con los valores obtenidos.

Básica
Z
x1
x2
s1
s2
s3
Solución
Z
1
0
0
0.48
0
-3.35
49.94
x2
0
0
1
0.03
0
-1.29
0.13
S2
0
0
0
 -0.03
1
2.29
3.87
x1
0
1
0
0
0
1
3

  • Hallando fila que sera reemplazada.

Básica
s3
Solución
Relación
x2
-1.29
0.13
No
S2
2.29
3.87
1.69
X1
1
3
3

  • Calcular  nueva Fila(S2):


Básica
Z
x1
x2
s1
s2
s3
Solución
Z
1
0
0
 0.44
1.46
0
 55.61
x2
0
0
1
0.01
0.57
0
2.31
S2
0
0
0
-0.01
0.44
1
1.69
x1
0
1
0
0.01
-0.44
0
1.31

Respuesta:
Z = 55.61
x2 = 2.31
X1 = 1.31
S3 = 1.69