2.利用lingo求解目标函数 Max z =1500x1+2500x2 约束条件 s.t.3x1+2x2≤652x1+

2.利用lingo求解
目标函数 Max z =1500x1+2500x2
约束条件 s.t.3x1+2x2≤65
2x1+x2≤40
3x2≤75
x1 ,x2 ≥ 0
Max z = 5x1 + 2x2 + 3x3 - x4
s.t.x1 + 2x2 + 3x3 =15
2x1 + x2 + 5x3 =20
x1 + 2x2 + 4x3 + x4 =26
x1 ,x2 ,x3 ,x4 ≥ 0
Max z = 5x1 + 2x2 + 3x3 - x4
s.t.x1 + 2x2 + 3x3 =15
2x1 + x2 + 5x3 =20
x1 + 2x2 + 4x3 + x4 =26
x1 ,x2 ,x3 ,x4 ≥0