x+(1.5x+30)=750 怎么解?
问题描述:
x+(1.5x+30)=750 怎么解?
答
x+(1.5x+30)=750
x+1.5x+30=750
2.5x=750-30
2.5x=720
x=720/2.5
x=288是直接拆括号么?嗯直接拆