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(3m+3n)^2乘(2m-3n)^2过程
人气:374 ℃ 时间:2020-01-27 20:09:35
解答
是不是(2m+3n)^2(2m-3n)^2
=[(2m+3n)(2m-3n)]^2
=(4m^2-9n^2)^2
=16m^2-72m^2n^2+81n^2
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