函数是高中数学的重要内容之一,函数表示法中的解析法是其重要的表示方法.优点是:函数关系清楚,容易从自变量的值求出其对应的函数值,便于用解析式来研究函数性质.不少刊物发表过如待定系数法、换元法、构造方程组法、分段函数法等诸如此类的方法.纵观近几年高考,解析式考查时, Function is one of the important contents of high school mathematics. The analytical method in function representation is its important representation method. The advantages are: the function is clear, it is easy to find the corresponding function value from the value of the independent variable, and it is easy to use the analytical formula. Research on the nature of functions. Many publications have published such methods as undetermined coefficient method, equivalence method, structural equations method, piecewise function method and so on. Throughout the college entrance examination in recent years, analytical examinations have been performed.