“期中必须修读1复习2”演示课件PPT[人教版必须修读1].ppt

3.函数y=xα叫做幂函数，其中x是自变量，α是常数. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第三章 函数的应用 函数与方程 函数模型及其应用 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. y=f(x)的图像与x轴的交点的横坐标叫做该函数的零点。即f(x)=0的解。 方程f(x)=0有实数根 函数y=f(x)的图象与x轴有交点 函数y=f(x)有零点 （一）函数的零点与方程的根 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. * 期中必修１复 习 第二课时 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 第二章 基本初等函数Ⅰ 指数函数 对数函数 幂函数 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 整数指数幂 有理指数幂 无理指数幂 指数 对数 定义 运算性质 指数函数 对数函数 幂函数 定义 图象与性质 定义 图象与性质 返回 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. （一）指数幂与根式运算 1.指数幂的运算性质 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2. a的n次方根 如果　　　，(n1,且n 　),那么x就叫做a的n次方根． (1)当n为奇数时，a的n次方根为 ,其 中　　　　　　　　　　　　 (2)当n为偶数时，a0时，a的n次方根 为　　；a0时，a的n次方根不存在． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3. 根式 ！根式　　对任意实数a都有意义， ！当n为正奇数时，　　　　， ！当n为正偶数时， Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 4. 分数指数幂 (1)正数的分数指数幂： 　　(2)零的正分数指数幂为零，零的负分数指数幂没有意义 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (a0， ) ！负数和零没有对数. ！常用关系式： （二）对数的概念及运算 1.概念 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (1) (2) (3) (a0,且a≠1,M0,N0 ) 2.对数运算