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计算:(x-2y+z)(-x+2y+z)要过程,谢
人气:354 ℃ 时间:2020-04-14 18:43:17
解答
(x-2y+z)(-x+2y+z)
=〔z+(x-2y)][z-(x-2y]
=z^2-(x-2y)^2
=z^2-(x^2-4xy+4y^2)
=z^2-x^2+4xy-4y^2
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