x⁴+y⁴+z⁴-2x²y²-2x²z²+2y²z²

问题描述:

x⁴+y⁴+z⁴-2x²y²-2x²z²+2y²z²
分解因式

=x⁴-2x²y²+y⁴-2x²z²+2y²z²+z⁴=(x²-y²)²-2(x²-y²)z²+z⁴=(x²-y²-z²)²