建立了一个模型但不知道怎么代码化
max=1200(x11+x12+x13)+800(x21+x22+x33)+700(x31+x23+x33);
9*x11+8*x21+6*x31<=2200；9*x12+8*x22+6*x32<=3200;
9*x13+8*x23+6*x33<=1200;
11*x11+6*x21+8*x31<=4200;
11*x12+6*x22+8*x32<=5400;
11*x13+6*x23+8*x33<=1200;
x11+x12+x13<=650;
x21+x22+x23<=1100;
x31+x32+x33<=900;
0.5775<(9*x11+8*x21+6*x31)/(9*x12+8*x22+6*x32)<=0.7975;
0.315<(9*x13+8*x23+6*x33)/(9*x12+8*x22+6*x32)<=0.435;
1.61<(9*x11+8*x21+6*x31)/(9*x13+8*x23+6*x33)<=2.05;

纯小白，真的被搞
破防了