80+1.5(x-80)+0.2x=640怎么算
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80+1.5(x-80)+0.2x=640怎么算
80+1.5(x-80)+0.2x=640怎么算
80+1.5(x-80)+0.2x=640怎么算
80+1.5(x-80)+0.2x=640
80+1.5x-120+0.2x=640
1.7x-40=640
1.7x=640+40
1.7x=680
x=680÷1.7
x=400
80+1.5(x-80)+0.2x=640
80+1.5x-120+0.2x=640
1.7x=680
x=400