本文介绍一种求解一类三次函数最大值的方法——参数法,即根据题设合理选择大于O的参数,利用基本不等式取等号的条件,通过解方程组求出函数取最大值时自变量的值,进而得到函数的最大值.下面以各类竞赛题为例加以说明. This paper introduces a method to solve the maximum value of a class of cubic functions-parameter method, that is, according to the question set reasonable selection of parameters greater than O, use the basic inequality to take the condition of the equal sign, and solve the equations to find the function when the maximum value is taken from The value of the variable, and then get the maximum value of the function. Below to illustrate the various types of competition.