计算(x+y-z)(x-y-z)

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2025-12-15 16:39:03
推荐回答(1个)
回答1:

(x+y-z)(x-y-z)
=(x-z+y)(x-z-y)
=(x-z)^2-y^2
=x^2+z^2-2xz-y^2