方程:(84+2x):(84+x)=6:5
问题描述:
方程:(84+2x):(84+x)=6:5
答
6/5=1.2
(84+2×)÷(84+×)=1.2
84+2x=84*1.2+1.2x
0.8x=84*0.2
x=21