2018年秋七年级数学上册第1章有理数1.2.4绝对值第2课时有理数的大小比较(预习)课件(新版)新人教版.ppt

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第一章 有理数,1.2 有理数 1.2.4 绝对值,第一章 有理数,第2课时 有理数的大小比较,第2课时 有理数的大小比较,探究新知,活动1 知识准备,右,左,第2课时 有理数的大小比较,活动2 教材导学,有理数的大小比较 1某一天5个城市的最低气温如下:哈尔滨20 、北京10 、长沙5 、上海0 、广州10 . (1)比较这一天下列两个城市间最低气温的高低(填“高于”或“低于”): 广州_上海;北京_上海;北京_哈尔滨;长沙_哈尔滨;长沙_广州,高于,低于,高于,高于,低于,第2课时 有理数的大小比较,右,2阅读教材第12页至第13页,然后说一说: (1)在数轴上表示的两个数,右边的数总比左边的数大吗? (2)正数都大于零吗?负数都小于零吗?正数大于负数吗?,第2课时 有理数的大小比较,

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