lingo 错误1017怎么办啊model:min=x1+x2+x3;=60;=11;=34;=20;=21;=21;=21;5*r11+6*r21+9*r31+11*r41
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正确的结果应该是：
Global optimal solution found.
Objective value: 37.00000
Objective bound: 37.00000
Infeasibilities: 0.000000
Extended solver steps: 1
Total solver iterations: 208727
Variable Value
X1 21.00000
X2 13.00000
X3 3.000000
R11 1.000000
R12 3.000000
R13 0.000000
R21 0.000000
R22 0.000000
R23 4.000000
R31 1.000000
R32 1.000000
R33 0.000000
R41 1.000000
R42 0.000000
R43 0.000000