a(x+y-z)-b(z-x-y)-c(x-z+y)
=a(x+y-z)+b(x+y-z)-c(x+y-z)
=(a+b-c)(x+y-z)
(x+y-z)(z-x-y) (x-2y+2)平方-(x-2y+2)(x+2y+2)
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