1.本单元重、难点分析指数函数与对数函数是两种重要的基本初等函数,是学习和研究其它函数的基础,其图象与性质的考查在历年高考中占有重要地位.本单元的重点知识有:对数的概念、性质及运算法则;指数函数、对数函数的图象及其性质。本单元的难点有:对数的概念及性质与法则的运? 1. The unit is heavy and difficult to analyze Exponential and logarithmic functions are two important elementary functions, is to learn and study the basis of other functions, the image and nature of the examination over the years occupy an important position in college entrance examination. Key knowledge are: the concept of the logarithm, nature and algorithm; exponential function, logarithm function of the image and its nature. The difficulty of this unit are: the concept of logarithm and the operation of the nature and the law?