[新苏教版四年级数学下册课件乘法分配律.ppt

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2017-01-06 发布于北京
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[新苏教版四年级数学下册课件乘法分配律.ppt

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[新苏教版四年级数学下册课件乘法分配律

四年级有6个班，五年级有4个班，每个班领24根跳绳。四五年级一共要领多少根跳绳？ * 苏教版四年级数学下册 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. 本节课我们主要来学习乘法运算律，同学们要结合生活实例理解并掌握乘法分配律的内容，能够应用乘法分配律解决相关的实际问题。 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. 回顾：乘法交换律： a×b = b × a 乘法结合律： a×b ×c = a×( b × c) 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. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (a + b)×c = a×c + b×c 用字母表示是：讨论归纳： 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. 游戏：交朋友（80 + 20）×4 80×4 + 20×4 （a + 100）×5 a×5 + 100×5 （42 + 45）× 42× + 45× = = = 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. 游戏：交朋友（80 + 20）×4 80×4 + 20×4 （a + 100）×5 a×5 + 100×5 （42 + 45）× 42× + 45× = = = 35×8 + 65×8 = （35 + 65）×8 9×12 + 9×282 = （12 + 282）×9 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.Slid