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8年级数学：先画出一次函数的草图，再判断参数的范围，简单
本节的内容主要讲述的是8年级下册第4章的内容：一次函数，在本小节中涉及的是画出草图，再判断参数的范围；
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26/61
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