2016苏教六级数学下册课件解比例.ppt

苏教版六年级数学下册 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 学会解比例的方法，进一步理解和掌握比例的基本性质。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 李明在电脑上把下面的照片按比例放 大，放大后照片的长是13.5厘米，宽 是多少厘米？ 6厘米 4厘米 X Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 6x=13.5×4 6x=54 x=9 答：放大后照片的宽是9厘米。 解：设放大后照片的宽是x厘米。 13.5 6=x 4 ： ： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 解：1.2x=75×0.4 1.2x=30 x=30÷1.2 x=25 = 1.2 75 0.4 x Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 9 x = 3 4 ： ： 3x=9×4 3x=36 x=12 解： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. = 0.1 0.01 100 x 0.1x=100×0.01 0.1x=1 x=1÷0.1 x=10 解： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. × 1 10 1 8 1 4 ： =x ： 1 8 X= 1 4 1 10 × 1 40 X= 1 8 ÷ 1 40 X= 8 X= 1 5 解： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 把左边的长方形按比例放大后得到右边的长方形，求未知数x。 20 12 50 x （单位：cm） Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 20 50 = 12 x ： ： 20x=50×12 20x=600 x=30 解: Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 小丽调制了两杯蜂蜜水，第一杯用了25毫升蜂蜜和200毫升水；第二杯用了30毫升蜂蜜和250毫升水。 （1）分别写出每杯蜂蜜水中蜂蜜和 水体积的比，看它们能否组成比例。 （2）照第一杯蜂蜜水中蜂蜜和水的比计算，300毫升水中应加入蜂蜜多少毫升？ 25 200 ： 30 250 ： = Evaluation only. Created with Aspose.Slides for .NET 3.5 Client P