3/8X+(3/8X+10)+20=x 计算

问题描述:

3/8X+(3/8X+10)+20=x 计算

这题有点儿太简单了.
(3/8)X+(3/8)X+10+20=x
(3/4)x+30=x
(1/4)x=30
x=120是啊