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数学
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一道计算题 (2n-3m)²(2n+3m)²
人气:356 ℃ 时间:2020-04-11 15:22:16
解答
(2n-3m)²(2n+3m)²
=[(2n-3m)(2n+3m)]²
=[4n²-9m²]²
=16n^4-72m²n²+81m^4
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