2/3x+3y/4=17/12 1/6x-y/2=-1/3

问题描述:

2/3x+3y/4=17/12 1/6x-y/2=-1/3

答:2/3x+3y/4=17/12…………(1)1/6x-y/2=-1/3………………(2)(1)两边乘以12、(2)两边乘以6整理得:8x+9y=17…………(3)x-3y=-2………………(4)(3)+(2)*3得:8x+3x=17-611x=11解得:x=1代入(3)得:1-3y=-2...