Mathematics
Senior High
（3）これはどうやって計算するのが良いですか？？
ちなみに答えは−x⁴-y⁴-z⁴+2x²y²+2y²z²+2z²x²です！
(3)(x+y+z)(ーx+y+z)(x-y+z)(x+y-z)
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