2(x+y)-(x-y)=3(x+y)-2(x-y)=1
题目不是这样的2(x+y)-(x-y)=3(x+y)-2(x-y)=1
2(x+y)-(x-y)=3①(x+y)-2(x-y)=1②①-②×2得:3(x-y)=1(x-y)=1/3;③到入(1)得:2(x+y)=3+1/3=10/3;x+y=5/3④③+④得:2x=2;x=1;带入得:y=1-1/3=2/3;望采纳