设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3
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![设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3](/uploads/image/z/3791665-1-5.jpg?t=%E8%AE%BE%E5%8F%98%E9%87%8Fx%2Cy%E6%BB%A1%E8%B6%B3%E7%BA%A6%E6%9D%9F%E6%9D%A1%E4%BB%B6y%3E%3D0.x-y%2B1%3E%3D0.x%2By-3)
设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3
设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3<=0,求目标函数z=2x+y的最大值
设变量x,y满足约束条件y>=0.x-y+1>=0.x+y-3
画图,在(3,0)点处取最大值,代入z=2x+y得6
可以用lingo求解,代码如下:
max=2*x+y;
y>=0;
x-y+1>=0;
x+y-3<=0;
结果为:
Global optimal solution found.
Objective value: 6.000000
Infeasibilities: ...
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可以用lingo求解,代码如下:
max=2*x+y;
y>=0;
x-y+1>=0;
x+y-3<=0;
结果为:
Global optimal solution found.
Objective value: 6.000000
Infeasibilities: 0.000000
Total solver iterations: 1
Variable Value Reduced Cost
X 3.000000 0.000000
Y 0.000000 1.000000
Row Slack or Surplus Dual Price
1 6.000000 1.000000
2 0.000000 0.000000
3 4.000000 0.000000
4 0.000000 2.000000
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