(x-y+z-m)(x-y-z+m)怎么算

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(x-y+z-m)(x-y-z+m)怎么算
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(x-y+z-m)(x-y-z+m)怎么算
(x-y+z-m)(x-y-z+m)怎么算

(x-y+z-m)(x-y-z+m)怎么算
原式=[(x-y)-(m-z)][(x-y)+(m-z)]
=(x-y)²-(m-z)²
=x²-2xy+y²-m²+2mz-z²