(100-x)/x=25% 求x怎么算?
问题描述:
(100-x)/x=25% 求x怎么算?
答
(100-x)/x=25%可化为
(100-x)/x=1/4进而
(100-x)*4=x
400-4x=x
400=5x
x=80
答
(100-x)/x=25%
100-x=25%x
x+0.25x=100
1.25x=100
x=100÷1.25
x=80
答
(100-x)/x=25%
(100-x)/x=1/4
x=400-4x
5x=400
x=80