[演示课件2]“有理数和其运算”复习.ppt

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. 负数的概念： 数轴：1.三要素： 原点、单位长度、正方向 0 1 2.数轴上的点从左到右逐渐变大 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. 绝对值： 正数的绝对值是它本身，0的绝对值是0，负数的绝对值是它的相反数 +5或-5 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. 两个负数比较大小，绝对值大的反而小 比较大小： = 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. 加、减、乘、除、乘方 加：（-5）+（-7）；（-8）+6 减： 5-（-6） ；（-3）- 8 乘方： -8 16 9 -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.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 混合运算： 先算乘方，再算乘除，最后算加减； 有括号的先算括号里面的. 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. (1)最小的正整数 (2)最大的负整数 (3)绝对值最小的有理数 (4)大于-3小于2的所有整数 (5)绝对值小于3的所有整数 (6)绝对值不大于3的所有整数 (7)绝对值大于3小于5的所有负整数 (8)在数轴上，与-2的距离为4的点 1 -1 0 -2、-1、0、1 -2、+2、-1、+1、0 -3、+3、-2、+2、-1、+1、0 -4 -6和+2 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.