{20%x+25}/{x-20%x-25}=5/6
问题描述:
{20%x+25}/{x-20%x-25}=5/6
答
(0.2x+25)/(0.8x-25)=5/6
5(0.8x-25)=6(0.2x+25)
4x-125=1.2x+150
2.8x=275
x=1375/14