函数是高中数学的核心内容,是最重要的概念之一.解析式是表达函数的最常用方法.求函数解析式方法众多,现对一些常用的方法进行总结.一、待定系数法已知函数类型(如一次函数、二次函数、指数函数、对数函数等)求解析式,首先设出函数解析式,然后根据已知条件通过代入求系数. Function is the core content of high school mathematics, is one of the most important concepts .Analytic expression is the most commonly used method of expression function. Seeking function analytic many, now summarizes some commonly used methods. Type (such as a function, quadratic function, exponential function, logarithm function, etc.) analytic formula, first set out the function analytic formula, and then according to the known conditions by substituting the coefficient.