x四次方-y四次方/x平方-2xy+y平方（分式约分）

网友回答

x四次方-y四次方/x平方-2xy+y平方
=(x²+y²)(x+y)(x-y)/(x-y)²
=(x²+y²)(x+y)/(x-y)
======以下答案可供参考======
供参考答案1:
(x^4-y^4)/(x^2-2xy+y^2)
=(x^2+y^2)(x^2-y^2)/(x-y)^2
=(x^2+y^2)(x+y)(x-y)/(x-y)^2
=(x^2+y^2)(x+y)/(x-y)
供参考答案2:
先约分 后加减