X/X+1=60%

问题描述:

X/X+1=60%
- -

答:
x/(x+1)=60%
x/(x+1)=0.6
x=0.6(x+1)
x=0.6x+0.6
x-0.6x=0.6
0.4x=0.6
x=0.6/0.4
x=1.5