6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
问题描述：
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
答
设x-y=m x+y=n
则6m-2n=14 3m+n=5
解得 m=2 n=-1
即x-y=2 x+y=-1
解得x=1/2 y=-3/2