2018年秋七年级数学上册第一章有理数1.2有理数1.2.4第2课时比较大形件新版新人教版201901222104.pptx

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流 程,学习目标,预习反馈,名校讲坛,巩固训练,课堂小结,1.2.4 绝对值 第2课时 比较大小,目,习,标,1理解比较有理数大小的规则的合理性 2会比较有理数的大小,反,习,馈,1.(1)在数轴上表示有理数,它们从左到右的顺序,就是从 到 的顺序, 即 的数 右边的数 (2)正数 0,0 负数,正数 负数;两个负数, 的反而小 2以下四个选项分别表示某天四个城市的平均气温,其中平均气温最低的是 ( )A3 B15 C10 D1 ,小,大,左边,小于,大于,大于,大于,绝对值大,C,反,习,馈,讲,校,坛,【点拨】异号两数比较大小,要考虑它们的正负;同号两数比较大小,要考虑它们的绝对值,讲,校,坛,讲,校,坛,例2 有理数x,y在数轴上的位置如图所示:(1)在数轴上表示x,y;(2)试把x,y,0,x,y这五个数用“”连接起来解:(1)如图所示(2)xy0yx.,【点拨】 数轴上的点表示的数右边的总比左边的大,讲,校,坛,训,固,练,训,固,练,小,堂,结,1两个负数比较大小,绝对值大的反而小 2正数大于零,零大于负数,正数大于负数 3用数轴如何比较两个数的大小?,THANK YOU!,

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