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3n²-4-3(n-1)²-4 化简
人气:347 ℃ 时间:2020-06-26 05:22:59
解答
3n²-4-3(n-1)²-4
=3(n+n-1)(n-n+1)-8
=3(2n-1)-8
=6n-11
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