初一数学去分母解一元一次方程1/2x - 3 =1/5x1- x+1/5 =xx+1/2 - 1=2-3x/31/2(x-1) - 1/5(x+2)=1/3x+1

问题描述:

初一数学去分母解一元一次方程
1/2x - 3 =1/5x
1- x+1/5 =x
x+1/2 - 1=2-3x/3
1/2(x-1) - 1/5(x+2)=1/3x+1

5x-30=2x 
x=10
5-5x+1=5x
x=3/5
6x+3-6=12-6x
x=5/4
15(x-1)-6(x+2)=10x+30
15x-6x-10x=15+12+30
x=-57