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(6n-3m^2)(3m^2+6n)
人气:321 ℃ 时间:2020-01-27 14:45:48
解答
(6n-3m^2)(3m^2+6n)=(6n-3m^2)(6n+3m^2)=(6n)^2-(3m^2)^2=36n^2-9m^4
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