(x-y+z)(x+y-z)-(y-z-x)(y+z-x)
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(x-y+z)(x+y-z)-(y-z-x)(y+z-x)(x-y+z)(x+y-z)-(y-z-x)(y+z-x)(x-y+z)(x+y-z)-(y-z-x)(y+z-x)(x+y-z)(x-y+z
(x-y+z)(x+y-z)-(y-z-x)(y+z-x)
(x-y+z)(x+y-z)-(y-z-x)(y+z-x)
(x-y+z)(x+y-z)-(y-z-x)(y+z-x)
(x+y-z)(x-y+z)-(y+z-x)(z-x-y)=(x+y-z)(x-y+z)+(y+z-x)(x+y-z)
所以公因式是(x+y-z)
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x^-(y-z)^/(x+y)^-z^
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