因式分解 x²-2xy+y²-z²
问题描述：
因式分解 x²-2xy+y²-z²
答
x²-2xy+y²-z²
=(x-y)^2-z^2
=(x-y-z)(x-y+z)
因式分解 x²-2xy+y²-z²
x²-2xy+y²-z²
=(x-y)^2-z^2
=(x-y-z)(x-y+z)