2分之3x-1-3分之x-y=1...4分之x-y+3分之x+2y=1

问题描述:

2分之3x-1-3分之x-y=1...4分之x-y+3分之x+2y=1

(3X-1)/2-(X-Y)/3=1
3(3X-1)-2(X-Y)=6
9X-3-2X+2Y=6
7X+2Y=9 1)
(X-Y)/4+(X+2Y)/3=1
3(X-Y)+4(X+2Y)=12
3X-3Y+4X+8Y=12
7X+5Y=12 2)
将1)-2)得
7X+2Y-7X-5Y=9-12
Y=1
将Y=1代入1)中,得
7X+2=9
X=1
解得:X=1,Y=1