(2m+3n-p) (2m-3n+p)等于多少!
人气：349 ℃ 时间：2020-05-19 08:56:56
解答
(2m+3n-p) (2m-3n+p)
=[2m+(3n-p)][2m-(3n-p)]
=4m²-(3n-p)²
=4m²-9n²+6np-p²
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