构建多元一次方程式
1620+30E+50F+50G+60H+70I=1400A
3040+60E+100F+100G+120H+140I=600B
1960+90E+150F+150G+180H+210I=1500C
4280+120E+200F+200G+240H+280I=900D
800+200C+150G+175H+200I=500E
1500+600C+450G+525H+600I=900F
2600+200A=1500G
6600+300A=1800H
5500+400A=2100I