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抓住2,3,5的倍数特征，按要求组成三位数，就变得轻松容易了
本节的内容主要讲述的是5年级数学第二章因数与倍数，本节内容涉及到2,3,5的倍数特征；
5年级数学：人教版下册章节复习，奥数精炼，同步+培优，分层练习47/76
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