(30-x)/(40-x)=3/5
问题描述:
(30-x)/(40-x)=3/5
答
两边乘5(40-x)
150-5x=120-3x
2x=30
x=15
(30-x)/(40-x)=3/5
两边乘5(40-x)
150-5x=120-3x
2x=30
x=15