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m^2-9n^2-m+3n

分类: 作业答案 • 2022-01-19 14:13:49

问题描述：

m^2-9n^2-m+3n

答

m^2-9n^2-m+3n
=(m+3n)(m-3n)-(m-3n)
=(m-3n)(m+3n-1)

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m^2-9n^2-m+3n

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