（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2
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（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2应该是(〖(x
（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2
（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2
（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2
应该是(〖(x-y)/(x+y))〗^2÷((y-x)/(x^2+2xy+y^2 ))^2吧,如果是的话答案就是（x+y）^2啦
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