1、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,*,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,*,北师大版三年级数学上册,周长的复习,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,难不倒我,一、什么是周长?,二、长方形的周长怎么计算?,三、正方形的周长怎么计算?,Evaluation only.,Created with Aspose
2、.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,生活中的数学问题,下个星期就要举行德兴小学运动会了,为了迎接运动会,运动员要在学校的,长方形操场,进行跑步训练,华华在,160米,的操场跑了一圈。,请问跑了,一圈,指的是什么?怎样求长方形的周长?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,生活中的数
3、学问题,琳琳在学校的,正方形操场,进行跑步训练,琳琳在,200米,的操场跑了一圈。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面图形的周长,4,厘米,3,厘米,5,厘米,2分米,5米,3米,6米,6米,8厘米,4厘米,5厘米,1厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyr
4、ight 2004-2011 Aspose Pty Ltd.,生活中的周长问题,1,、,琳琳在学校的正方形操场进行跑步训练,琳琳在200米的操场跑了一圈,请问这个正方形的边长是多少?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,生活中的周长问题,2、,学校的操场是一个长方形,长50米,宽30米,华华沿着操场跑了两圈,他跑了多少米?,Evaluation only.,Created with Aspose.Sl
5、ides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,生活中的周长问题,3、,学校的操场是一个长方形,华华沿着操场跑了三圈,他一共跑了480米,这个长方形的长是50米,那么宽是多少呢?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算左面两个图形的周长,并说说它们的周长一样吗?为什么?,4厘米,6厘米,Eval
6、uation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation onl
7、y.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created
8、 with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspo
9、se.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides
10、for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.
11、5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面两个图形的周长,并说说它们的周长一样吗?为什么?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算左面两个图形的周长,并说说它们的周长一样吗?为什么?,4厘米,6厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5
12、Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算左面两个图形的周长,并说说它们的周长一样吗?为什么?,6厘米,4厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,图中和哪个图形的周长较长?,4厘米,4厘米,4厘米,6厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 C
13、lient Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把一个长是10厘米,宽是4厘米的长方形剪成两个大小和形状都相同的长方形。然后求出一个长方形的周长。,10厘米,4厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,情况一,2厘米,10厘米,4厘米,5厘米,情况二,Evaluation only.,Created with Aspose.Slid
14、es for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,有两个同样的长方形,长都是7厘米,宽都是3厘米。把他们拼成一个图形周长是多少?,情况一,:,7厘米,3+3=6厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,情况二:,7+7=14厘米,3厘米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,谢谢!,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,