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(m-n+p)(m+n-p)等于多少
人气:284 ℃ 时间:2020-09-10 06:44:04
解答
(m-n+p)(m+n-p)
=[m-(n-p)][m+(n-p)]
=m²-(n-p)²
=m²-n²+2np-p²
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