解方程3/4X=20+1/4X急...

问题描述:

解方程3/4X=20+1/4X急...

3/4x--1/4x=20
(3/4--1/4)x=20
1/2x=20
x=40

1/2x=20
x=40

3/4X=20+1/4X
2/4X=20
X=40

3/4X=20+1/4X
两边同乘以4
3x=80+1
3x=81
x=27