5x-2.5(70-x)=70这道题怎么写
问题描述:
5x-2.5(70-x)=70这道题怎么写
答
5x-175+2.5x=70
7.5x=70+175
7.5x=245
x=3分之98
答
5x-2.5(70-x)=70
5x-175+2.5x=70
7.5x=70+175
x=245÷7.5
x=32又2/3
答
5x-175+2.5x=70
7.5x=70+175
7.5x=245
x=3分之98
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答
5x-175+2.5x=70
7.5x=245
x=30