(x+y-z)(x-y+z)-(y+z-x)(z-x-y)的公因式是?
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(x+y-z)(x-y+z)-(y+z-x)(z-x-y)的公因式是?
(x+y-z)(x-y+z)-(y+z-x)(z-x-y)的公因式是?
(x+y-z)(x-y+z)-(y+z-x)(z-x-y)的公因式是?
(x+y-z)(x-y+z)-(y+z-x)(z-x-y)
=(x+y-z)(x-y+z)+(y+z-x)(x+y-z)
∴公因式为(x+y-z)
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