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计算(x-y+z)的二次方减(x+y-z)的二次方
人气:375 ℃ 时间:2020-05-07 06:32:03
解答
(x-y+z)^2-(x+y-z)^2
=(x-y+z+x+y-z)(x-y+z-x-y+z)
=2x(2z-2y)
=4x(z-y)
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