-9m^2-6m-1+n^2
张抽抽2022-10-04 11:39:541条回答
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一双慧眼123 共回答了21个问题 |采纳率95.2%- -9m^2-6m-1+n^2
=n^2-(9m^2+6m+1)
=n^2-(3m+1)^2
=(n+3m+1)(n-3m-1) - 1年前
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