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8年级数学：由四边形内角和求∠B的度数，平行线的性质也很常用
本节的内容主要讲述的是8年级下册第3章的内容：平行四边形，在本小节中涉及的是由四边形内角和求∠B的度数；
8年级数学：人教版下册章节复习，同步+培优，分层练习，查漏补缺7/61
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