【(x²+y²)-(x-y)²+2y(x-y)】/4y=1可化简为【x²+y²-x²-y²+2xy+2y（x-y）】/4y=1也即【2y*x+2y（x-y）】/4y=1 也即2y（2x-y）/4y=1即y=2x-24x/4x²-y²-1/2x+y=1/x -y...