5x-(120-x)x3.75=162.5 求求你们了
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5x-(120-x)x3.75=162.5 求求你们了
5x-(120-x)x3.75=162.5
求求你们了
5x-(120-x)x3.75=162.5 求求你们了
5x-(120-x)x3.75=162.5
5x-450+3.75x=162.5
8.75x=612.5
x=70