问题描述:x-y/2-x+y/5=13(x-y)+2(x+y)=6最佳答案: 解:(x-y)/2-(x+y)/5=15(x-y)-2(x+y)=105x-5y-2x-2y=103x-7y=10 ①3(x-y)+2(x+y)=63x-3y+2x+3y=65x-y=6 ②②×7-①可得,35x-3x=42-10,即x=1,将x=1代入②中可得,5-y=6,即y=-1 ?? 点击显示答案