15000x+3000x+800（350-2.5）=50

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15000x+3000x+800(350-2.5)=500000
18000x+278000=500000
18000x=222000
X=111/9

18000x+280000+2000＝50
x＝（50－280000－2000）/18000

15000x+3000x+800（350-2.5）=50（15000+3000）x+278000＝50
18000x=50-278000
x=-277950/18000
x=-15又120分之53

15000x+3000x+800（350-2.5）=50 (3000-x)*(x-1000)=800求解 x x X x x x x x x x x |x| X x x X