北师大版五年级数学上册第一单元-小数除法讲课讲稿.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,北师大版 五年级上册 第一单元 小数除法,问题,探究,练习,拓展,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3,5,7 3,3,2,6,1,3,4,1 2,1,733,24.333,0,9,1,0,9,1,0,3,3,9,1,9.4,11,0,8,6,8,5 5,5,9.411,0.85454,0,4 4,6,0,5 5,5,0,4,5,4 4,6,8,0,4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,像24.333 ，0.85454这样从小数部分的某,一位起，一个数字或几个数字依次不断重,复出现的小数，我们给它取一个名字 叫,循环小数,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一个循环小数依次不断重复出现的数字，,叫作这个循环小数的循环节。,循环小数可以只写一个循环节，并在首位和,末位上各点一个圆点。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,12,13,15,17,0.5,=0.333,0.2,=0.142857142857,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.,算一算，它们的速度分别是每时多少千米？哪些是循环小数？（结果保留两位小数）,飞鱼：196,365.33,65.33（千米）,章鱼：131,526.5（千米）,鲨鱼：241,640.166,40.17（千米）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.下面哪些数是循环小数？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.计算下面各题，并说一说哪几题的商是循环小数？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4.猎豹是动物中的短跑冠军，速度可以达到100千米/,时。照这样的速度，它平均每分能奔跑多少千米？,（结果保留两位小数）,100,601.666,1.67（千米）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,北师大版 五年级上册 第一单元 小数除法,问题,探究,练习,拓展,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,30.8（47）,30.828,1.1（千克）,方法一,方法二,30.847,7.77,1.1（千克）,答：一个人平均每天产生1.1千克生活垃圾。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.33.55,1.30.7,0.6（吨）,答：这个小区周末每天要多处理0.6吨生活垃圾。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,（16.82.1）0.7,18.90.7,27,0.96（5.40.9）,0.966,0.16,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.算一算，并与同伴说一说运算顺序。,90,（3.61.8）,3.6,0.41.2,5,3.4,7.8,3.9,0.36,0.3,4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.淘气家9月每天预订3袋纯牛奶，按批发价共付85.5元，,这样每袋比零售价便宜多少元？,1.185.5303,1.10.95,0.15（元）,答：这样每袋比零售价便宜0.15元。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4.王奶奶从冷饮批发部买回两箱冰棍。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,