2(x-y)/3-(x+y)/4=-1化简得8(x-y)-3(x+y)=-12 ①6(x+y)-4(2x-y)=16化简得3(x+y)-2(2x-y)=8 ②由②得3(x+y)=2(2x-y)+8 ③将③整体代入①得8(x-y)-2(2x-y)-8 =-128x-8y-4x+2y=-44x-6y=-42x-3y=-2 ④由②去括号得3x+3y-4x+2y=8即-x+5y=8 ⑤⑤*2+④得10y-3y=16-27y=14y=2代入⑤得-x+10=8x=2