因式分解 :(x+y-z)(x-y-z)+(y-x+z)(y-x-z)
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因式分解:(x+y-z)(x-y-z)+(y-x+z)(y-x-z)因式分解:(x+y-z)(x-y-z)+(y-x+z)(y-x-z)因式分解:(x+y-z)(x-y-z)+(y-x+z)(y-x-
因式分解 :(x+y-z)(x-y-z)+(y-x+z)(y-x-z)
因式分解 :(x+y-z)(x-y-z)+(y-x+z)(y-x-z)
因式分解 :(x+y-z)(x-y-z)+(y-x+z)(y-x-z)
(x+y-z)(x-y-z)+(y-x+z)(y-x-z)
=(x+y-z)(x-y-z)-(x-y-z)(y-x-z)
=(x-y-z)(x+y-z-y+x+z)
=(x-y-z)2x
=2x(x-y-z)
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