3(x+y)-4(x-y)=4 ......(1)(x+y)/2+(x-y)/6=1 ......(2)(2)两边同乘以6得:3(x+y)+(x-y)=6 ......(3)(3)-(1)得:5(x-y)=2x-y=2/5 ......(4)(3)×4+(1)得:15(x+y)=28x+y=28/15 ......(5)(4)+(5)得:2x=34/15x=17/15(4)-(5)得:2y=22/15y=11/15