x⁴+y⁴+z⁴-2x²y²-2x²z²+2y²z²分解因式
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x⁴+y⁴+z⁴-2x²y²-2x²z²+2y²z²分解因式
x⁴+y⁴+z⁴-2x²y²-2x²z²+2y²z²
分解因式
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
(x²-y²-z²)²