北师大版数学四年级下册《手拉手》PPT课件之二2013.pptVIP

北师大版数学四年级下册《手拉手》PPT课件之二2013.ppt

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3.如果每人回收1.5千克废纸,我们班回收的废纸可生产多少千克再生纸? 4.地球绕太阳转1圈要365.25天,绕太阳4圈需要多少天?你知道为什么通常“四年一闰”了吗? * 北师大版四年级数学下册 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 本节课我们通过手拉手互助的活动,来学习乘法运算律在小数乘法中的应用,同学们要能够自己分析解决有关小数乘法的一些应用题,能够用简便算法的要用简便算法进行计算。 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. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 好啊! 我俩帮帮3名希望小学的同学吧! 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. 4.8X2.5 =1.2X4X2.5 =1.2X(4X2.5) =1.2X10 =12 乘法结合律 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3.7×9.8 =3.7×(10-0.2) =3.7×10-3.7×0.2 =37-0.74 =36.26 乘法分配律 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2.6×7+1.8= 4.8×9-12.5= 1.25×3.6-2.15= Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 数学 诊所 数学 诊所 13+87×0.5 =100×0.5 =50 0.4×8.7×2.5 =(0.4×2.5)×8.7 =1×8.7 =8.7 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3.2+1.3×4 (4+0.4)×2.5 2.5×2.8×4 22-1

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