看小明的体重是不是爸爸的 35 ÷ 75 = 15 7 预设 2: 看看小明的体重是不是比爸爸轻( 75 - 35 )÷ 75 = 15 8 15 8 看看小明的体重是不是 35 千克预设 3: 75 ×(1-)= 35 15 8Evaluation only. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 三、巩固练习,提升认识三、巩固练习,提升认识 27 “1”还剩读了 35 页?页 1.这本课外读物一共有多少页? 这本课外读物我读了 35 页,还剩下没读。 7 2 预设 1: 解:设这本课外读物一共有 x页。 x-x= 35 x= 35 x= 49 7 27 5 预设 2: 解:设这本课外读物一共有 x页。(1-)x= 35 x= 35 x = 49 7 27 5Evaluation only. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd.
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