七年级数学上册第二章有理数2.2《数轴(2)》课件(新版)青岛版.ppt

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2.2 数轴(2),第二章 有理数,情境导航中,按顺序写出各城市当天的最低气温是:,-8,-19,-2,0,-6,-13,7,10,-5,15,情境导航中,按顺序写出各城市当天的最低气温是:,-8,-19,-2,0,-6,-13,7,10,-5,15,-19,-13,-8,-5,-2,0,7,10,15,-6,解:,例2,在下面各题的空格处,分别填上大于号或小于号(“”或“”),并说明理由.,(1)2.5_0,(2)-1_0,(3)1_-100,(4)-3_-2,(1)2.50 (正数大于零),(2)-10 (负数小于零),(3)1-100 (正数大于一切负数),(4)-3-2 (在数轴上,右边的点所表示的数比左边的点表示的数大),例3,(1) 1-2,(2) -3.2-2.3,(4) -5-33,1、教科书第35页练习 2、习题2.2第3、4、5、6题,

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