x/2+y/3=2 ，则x=4-2y/3，代入 4(x-y-1）=3（1-y）-2，得4(4-2y/3-y-1)=3(1-y)-2则12-20y/3=1-3y则11=11y/3解得y=3代入x=4-2y/3，解得x=2
