（x-1)(2y+1)=2(x+1)(y-1)2xy-2y+x-1=2xy+2y-2x-23x-4y+1=0①x(2+y)-6=y(x-4)2x+xy-6=xy-4y2x+4y-6=0②两式相加5x-5=0x=1,y=1
