(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2

问题描述:

(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