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4【a-b】²-【a+b】²=?
人气：387 ℃ 时间：2020-04-02 07:41:48
解答
原式
=【2（a-b）】²-（a+b）²
=【2（a-b）+（a+b）】【2（a-b）-（a+b）】
=（3a-b）（a-3b）
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