(x+15)*6/2-(15-x)*6/2=18怎么解
问题描述:
(x+15)*6/2-(15-x)*6/2=18怎么解
答
(x+15)*6/2-(15-x)*6/2=18
3(x+15)-3(15-x)=18
x+15-15+x=6
2x=6
x=3