长方体和正方体表面积的变化讲课教案.ppt

新课程新课程新课程新课程 新思想新思想新思想新思想 新理念新理念新理念新理念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.用两个体积是1立方厘米的正方体拼成一个长方体，体积有没有变化？Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.比较拼成的长方体的表面积与原来两个正方体的表面积的和，你有什么发现？减少2平方厘米减少2平方厘米减少了原来两个面的面积Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用3个这样的正方体拼成一个长方体，表面积比原来减少几个正方形面的面积？减少2个面减少2个面Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用4个这样的正方体拼成一个长方体，表面积比原来减少几个正方形面的面积？减少2个面减少2个面减少2个面Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.减少2个面减少2个面减少2个面减少2个面 减少2个面正方体的个数2345原来正方体一共有几个面12拼成后减少了原来几个面的面积21862483010Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用下面的两个长方体拼成三个不同的大长方体，你有什么发现？5cm4cm3cm5cm4cm3cmEvaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用下面的两个长方体拼成三个不同的大长方体，你有什么发现？5cm4cm3cm5cm4cm3cmEvaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用下面的两个长方体拼成三个不同的大长方体，你有什么发现？5cm4cm3cm5cm4cm3cmEvaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用下面的两个长方体拼成三个不同的大长方体，你有什么发现？5cm4cm3cm5cm4cm3cmEvaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用下面的两个长方体拼成三个不同的大长方体，你有什么发现？5cm4cm3cm5cm4cm3cm都减少了原来两个面的面积542532342表面积最小Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.努努力力吧吧！Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用6个体积是1立方厘米的正方体可以拼成不同的长方体（如下图）。哪个长方体的面积大？大多少？Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.用小棒和橡皮泥球，可以做出不同的长方体或正方体框架。小组合作，先填写选料单，再动手做一做，各做出3个。材料10厘米8厘米6厘米5厘米数量（）团（）根（）根（）根（）根Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.调查几个长方体家用电器包括包装盒长、宽、高的数据，算出它们的表面积和体积。电器名称长/cm 宽/cm 高/cm表面积/cm2体积/cm3Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.谢谢 谢谢制作：刘昱娇Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.