lingo问题 错误代码11 max=3*x1+9*x2; x1+3*x2<=22; -x1+x2<=4; x2<=6; 2*x1-5*x2<=0;

lingo问题 错误代码11 max=3*x1+9*x2; x1+3*x2<=22; -x1+x2<=4; x2<=6; 2*x1-5*x2<=0;

max=3*x1+9*x2;
x1+3*x2<=22;
-x1+x2<=4;
x2<=6;
2*x1-5*x2<=0;

运行结果：
Global optimal solution found.
Objective value: 66.00000
Infeasibilities: 0.000000
Total solver iterations: 2

Variable Value Reduced Cost
X1 10.00000 0.000000
X2 4.000000 0.000000
Row Slack or Surplus Dual Price
1 66.00000 1.000000
2 0.000000 3.000000
3 10.00000 0.000000
4 2.000000 0.000000
5 0.000000 0.000000

你好！ x1、x2是方程2x²-3x-1=0，根据韦达定理有： x1+x2=3/2，x1x2=-1/2； (1)原式=(x1+x2)/x1x2=-3； (2)原式=(x1+x2)²-2x1x2=9/4+1=13/4； (3)原式=(x1+x2)-4x1x2=9/4+2=17/4; (4)你的题目好像有问题，估计是：x2/x1+x1/x2 =(x2²+x1²)/x1x2=13/4÷(-1/2)=-13/2; (5)原式=x1x2-2(x1+x2)+4=3/2+1+4=13/2； (6)原式=x1x2+2+1/x1x2=3/2+2+2/3=25/6.

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