Question

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

Answer 1

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

追问

怎么算的？

追答

.......无语
x^2-y^2/(x+y)^2
=2(x-y)/2(x+y)
=(x-y)/(x+y)
=x-y/x+y
要是明白了请给我选为满意回答谢谢。