长方体正方体认识(修改)电子教案.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,*,长方体,和,正方体,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,顶点,棱,面,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,课前练习一：,(),(),(),顶点,棱,面,正方体各部分的名称是什么？,练习一,练习二,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,探究一,探究二,探究三,（都相等,、不都相等),（都相等,、,不都相等）,有,个面，,有,个面，,有,条棱，,有,条棱，,有,个顶点，,有,个顶点，,所有的棱,所有的棱,6,12,8,不都相等,都相等,6,12,8,（）是特殊的（）。,正方体,长方体,正方体：,长方体：,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,判断下面哪几个图形是长方体？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把物体的编号填在相应的横线上,（长方体包括正方体）,长方体：,其中，正方体：,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,要搭成正方体，还缺几个小球？几根小棒？,缺()个小球,()根小棒,2,6,缺()个小球,()根小棒,1,4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,搭一个正方体需要,()个,小球、,（）根,小棒。,(,长短相等的,)小棒。,探究一,探究二,探究三,8,12,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,要搭成正方体，还缺几个小球？几根小棒？,缺()个小球,()根小棒,4,7,缺()个小球,()根小棒,3,6,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,要搭成正方体，还缺几个小球？几根小棒？,缺()个小球,()根小棒,2,6,缺()个小球,()根小棒,3,8,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,数一数有几个小正方体,5个,6个,5个,1个,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,数一数有几个小正方体,16个,27个,8个,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,6个,5个,6个,6个,数一数有几个小正方体,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,8个,7个,14个,数一数有几个小正方体,10个,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,这是一个正方体，,至少,有（）个这样的正方体，能拼成一个较大的正方体。,8,8个,再大一点,27个,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,12,15,27-12=15,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,选择,搭一个正方体模型需要（）,A、8根一样长的小棒,B、12根一样长的小棒,C、16根一样长的小棒,D、6根一样长的小棒,B,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,选择,搭一个长方体模型需要（）,A、8根一样长的小棒,B、12根一样长的小棒,C、4根一样长的小棒为一组，3组共12 根,D、3根一样长的小棒为一组，4组共12 根,C,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,长方体的6个面上都有（）个直角,A、4B、6C、12D、24,A,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,30根一样长的小棒和24个小球最多能搭出,（）个正方体。,A、1B、2C、3D、4,B,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,填一填,（1）长方体有（）个面，（）条棱，,（）个顶点。,（2）长方体相对的面,形状（），,大小（），相对的棱长度（）。,6,12,8,相同,相等,（3）一个长方体最多可能有（）个 面是正方形。,2,相等,（4）一个面上有（）个()角,一共有（）个直角,4,直,24,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,填一填,（1）正方体有（）个面，（）条棱，,（）个顶点。,（2）正方体6个面都是（），,12条棱长度（）。,6,12,8,正方形,都相等,（3）一个面上有（）个(),一共有 （）个直角,4,直角,24,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,判断,1、长方体的每条棱都不相等。（）,2、正方体的6个面都是正方形。（）,3、长方体的6个面一定都是长方形。（）,4、有6个面，8个顶点，12条棱的图形一定是长方体或正方体。（）,不都相等,可能有两个面是正方形,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.,