状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,声 明,本文件仅用于个人学习、研究或欣赏，以及其他非商业性或非盈利性用途，但同时应遵守著作权法及其他相关法律的规定，不得侵犯本司及相关权利人的合法权利。,除此以外，将本文件任何内容用于其他用途时，应获得授权，如发现未经授权用于商业或盈利用途将追加侵权者的法律责任。,武汉天成贵龙文化传播有限公司,湖北山河律师事务所,*,*,*,*,长白山雾凇,零下,20,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,长白山雾凇状元成才路状元成才路状元成才路状元成才路状元成才路,三亚海滩,零上,30,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,三亚海滩状元成才路状元成才路状元成才路状元成才路状元成才路状,第1课时 负数的初步认识,R,六年级下册,负数,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,第1课时 负数的初步认识R六年级下册负数状元成才路状元成,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,情境导入,1,3,4,1,2,4,5,2,0,3,关于温度，你知道些什么？,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,水沸腾时的温度是,100,。,水结冰时的温度是,0,。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,水沸腾时的温度是100。水结冰时的温度是0。状元成才路状,地球表面的最低气温在南极，是,-88.3,月球表面的最低气温是,-183,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,地球表面的最低气温在南极，是-88.3月球表面的最低气温是,例如：气象台的气温预报,气温预报中的,-3,和,3,各表示什么意思？,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,例如：气象台的气温预报气温预报中的-3 和3 各表示什么,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,什么是负数？,我们将前面带有“,-,”的数叫做负数，,定义：,例如：,-3,、,-5,、,-15,都是负数。,像,8,、,15,、,30,这样的数叫做正数。（数字前面的正号可以省略不写）,状元成才路状元成才路状元成才路状元成才路状元成才路 什么是负,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,-3,3,和,-3,：表示零下,3,摄氏度。,-3,当中的“,-,”读作：负号。所以“,-3,”读作：负三。,3,：表示零上,3,摄氏度。,-3,和,3,是一对相反的量。,1,2,+3,读作：正三，“,+,”读作：正号。,3,状元成才路状元成才路状元成才路状元成才路状元成才路-3 3,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,根据上图中的信息填写下表，,并,说一说各数表示什么意思。,城市,北京,哈尔滨,上海,武汉,长沙,海口,最高气温,/,最低气温,/,4,12,19,27,4,1,2,3,3,0,23,20,状元成才路状元成才路状元成才路状元成才路状元成才路根据上图中,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,城市,北京,哈尔滨,上海,武汉,长沙,海口,最高气温,/,最低气温,/,4,12,19,27,4,1,2,3,3,0,23,20,从表中我们看到,北京的最高气温是,4,，,上海的最高气温是,4,。,1,3,4,1,2,4,5,2,0,3,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路城市北京哈,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,牛刀小试,-6,+10,-106,+88,99,0,正数,负数,0,是正数还是负数呢？,1.,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,“,0,”作为正数和负数的分界点，它既不是正数也不是负数。,0,正数,负数,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2.,用正、负数表示。,（,1,）零上,13.5,摄氏度表示为：,（,2,）零下,23.5,摄氏度表示为：,-23.5,+13.5,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,3.,甲地气温是,+18,，,表示（）,读作：（）,乙地气温是,-6,，,表示（）,读作：（）,零上十八摄氏度,正十八摄氏度,零下六摄氏度,负六摄氏度,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,我们在存折中经常见到正、负数,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路我们在存折,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2000.00,表示什么？,存入,2000,元,-500.00,表示什么？,支出,500,元,-132.00,表示什么？,支出,132,元,500.00,表示什么？,存入,500,元,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,总 结,数,正数,包括正整数、正分数、正小数,大于,0,0,0,既不是正数，也不是负数，它是正、负数的分界点,负数,包括负整数、负分数、负小数,小于,0,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,正、负数的读写法,写法,读法,负数,正数,先写“,-,”，再写数。如：负三写作：,-3,。,先读“负”，再读数。如：,-4,读作：负四。,先写“,+,”，再写数。“,+,”也可以省略不写。如：正三写作：,+3,或,3,。,先读“正”，再读数。不带“,+,”的直接度数。如：,+4,读作正四；,23,读作“二十三”。,状元成才路状元成才路状元成才路状元成才路状元成才路正、负数的,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,拔高训练,1.,填一填：,（,1,）如果盈利,150,元，记作,+150,元，那么亏损,100,元，应记作（）元。,（,2,）公交车上来乘客,8,人，用,+8,表示，那么下去乘客,6,人，应用（）表示。,100,6,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,（,3,）一个物体可以上下平移，向下平移,12m,，记作,12m,，那么,20m,，表示（,），物体原位不动时记作（,）。,向上平移,20,m,0 m,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,（,）（,）（,）,2.,写出温度计上的温度。,7,0,8,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,3.,读出下面各数，并指出哪些是正数？哪些是负数？,正数,负数,3,2.5 0,5.2,41,1,3,4,5,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,-3,读作：,2.5,读作：,4,5,负三,二点五,读作：,正五分之四,5.2,读作：,负五点二,1,3,读作：,读作：,41,正四十一,负三分之一,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,4.,世界上最高山峰珠穆朗玛峰比海平面高出,8848,米，如果这个高度表示为,8848,米，那么比海平面低,365,米的海底的高度，应表示为（）米，海平面的高度为（）米。,-365,0,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,1.,完成,P6,第,2,3,题；,2.,完成练习册本课时的习题。,课后作业,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,Jva8TLnO