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1、无锡市厚桥实验小学陈丽琴Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.v +Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.434386检验：把x=43代入原方程左边=243-22 =86-22 =64右边=64因为方程左边=右边所以=4
2、3是原方程的解 列方程解决实际问题检验答案是否正确，不光要检验结果是不是方程的解，还要把答案作为已知条件，看能不能满足题目中数量关系。你们求得小雁塔高43米，它的2倍是86米，大雁塔高64米，64米的确比86米少22米，这样才能说明答案是正确的Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.264 = 222 64 + 64 = 22 + 642= 86=4343Evaluation only.Created wit
3、h Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.列方程解决实际问题的一般步骤：1、根据题目中的条件寻找数量之间的等量关系，列出一个最容易发现的等量关系。2、分清等量关系中的已知数量和未知数量，确定设哪个数量为。3、根据关系式列出方程。4、解出方程后要检验。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty
4、 Ltd. 解：设香港青马大桥全长大约千米16+ 0.8 = 3616+ 0.8 0.8 = 36 0.816= 35.2= 2.2答：香港青马大桥全长大约2.2千米Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.4= 36解：4+ 20 20 = 56 - 2044= 364 = 9解：1.8 -1.8 + 7= 3.9 - 1.87= 2.177= 2.17解：5-8.3+8.3 = 10.7+8.35=1955
5、 = 195= 3.8= 0.3Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.3+154-80解：设猫的最快时速是千米2+20 = 110 2= 110-20 2= 90 = 902 = 45答：猫的最快时速是45千米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.
