2x/(x+12)=1/2怎么算

问题描述:

2x/(x+12)=1/2怎么算

2x/(x+12)=1/2
x+12=4x
4x-x=12
3x=12
x=4

2x×2=x+12;
4x=x+12;
3x=12;
x=4;

2x/(x+12)=1/2 两边乘以 2 (x+12)
4x=x+12
3x=12
x=4