x-0.5x=16 5(x+2.5)=30用方程解.

问题描述:

x-0.5x=16 5(x+2.5)=30用方程解.

x-0.5x=16 0.5x=16
x=32
5(x+2.5)=30
5x+12.5=30 5x=17.5 x=3.5