(x^2-y^2)/(xy-y^2/x+y)分式的乘除

问题描述:

(x^2-y^2)/(xy-y^2/x+y)分式的乘除

(x^2-y^2)/(xy-y^2/x+y)
=(x+y)(x-y)*(x+y)/y(x-y)
=(x+y)^2/y