(1+2x)÷3=x-1 120÷x-120÷1.5x=8

问题描述:

(1+2x)÷3=x-1 120÷x-120÷1.5x=8

(1+2x)÷3=x-1
两边乘3
1+2x=3x-3
3x-2x=1+3
x=4
120÷x-120÷1.5x=8
120÷x-80÷x=8
40÷x=8
x=40÷8
x=5