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(x+y+z)^2-(x-y-z)^2因式分解
人气:231 ℃ 时间:2020-05-03 11:49:52
解答
(x+y+z)^2-(x-y-z)^2=
(x+y+z+x-y-z)(x+y+z-x+y+z)=2x(2y+2z)=4x(y+z)=4xy+4xz
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