运行结果为：
Feasible solution found.
Extended solver steps: 12 Total solver iterations: 346 Model Title: 钢管下料；
Variable Value Row Slack or Surplus X1 56.00000 1 0.000000 R11 1.000000 2 0.000000 X2 44.00000 3 22.00000 R12 0.000000 4 18.00000 X3 22.00000 5 17.00000 R13 2.000000 6 30.00000 R21 1.000000 7 0.6000000 R22 1.000000 8 1.300000 R23 0.000000 9 1.400000 R31 1.000000 10 0.9000000 R32 1.000000 11 0.2000000 R33 1.000000 12 0.1000000 R41 0.000000 13 12.00000 R42 2.000000 14 22.00000 R43 0.000000