1.本单元重、难点分析本单元的重点:通过用“二分法”求方程的近似解,体会函数的零点与方程根之间的联系,初步形成用函数观点处理问题的意识;认识指数函数、对数函数、幂函数等函数模型的增长差异,体会直线上升、指数爆炸与对数增长,应用函数模型解决简单的实际问题.本单元的难 1. The unit is heavy and difficult to analyze the key points of this module: Through the “dichotomy” to find the approximate solution of the equation, to understand the zero point of the function and the root of the equation, the initial formation of the function point of view to deal with the problem awareness; cognitive exponential function , Logarithmic function, power function and other functional model of the growth difference, experience linear rise, exponential explosion and logarithm growth, the application of functional model to solve simple practical problems. The difficulty of this unit