数学因式分解 急 急 急 急 急

题出错了啊 少一个“）”

x(x+1)(x-1)+xy(x-y)-y(y+1)(y-1)
解：
x(x+1)(x-1)+xy(x-y)-y(y+1)(y-1)
= x(x^2-1)+xy(x-y)-y(y^2-1)
= x^3-x+xy(x-y)-y^3+y
=x^3-y^3+xy(x-y)-(x-y)
=(x-y)(x^2+xy+y^2)+xy(x-y)-(x-y)
=(x-y)(x^2+xy+y^2+xy-1)
=(x-y)[(x+y)^2-1]
=(x-y)(x+y+1)(x+y-1)

很简单啊
拆开就行了
（x-y）*（x+y+1）*（x+y-1）