x-1/5x-20-(1/5x 20)=8怎么解
问题描述:
x-1/5x-20-(1/5x 20)=8怎么解
答
x-1/5x-20-(1/5x+20)=8 两边乘(x+20)(x-20)
x-1/5x-1/5x=8+20+20
3/5x=48
x=48*5/3
x=80