(50-x)/x=25%,这题怎么算?
问题描述：
(50-x)/x=25%,这题怎么算?
答
(50-x)/x=25%
(50-x)/x=1/4
4(50-x)=x
200-4x=x
4x+x=200
5x=200
x=40
经检验x=40是方程的解