高中阶段对函数的综合运用的考查,很多是与恒成立问题及有解问题有关,这类问题一般是求参数的取值范围。一般地,解决这类问题有两种方法,一是对含参数的函数进行分类讨论,通过求最值的方法来解决,但一般分类讨论的过程会比较复杂,不同的题型涉及的解法也不相同,有时解法相当复杂且难以想象。二是分离参数的方法,这种方法的最大优点就是把含参数问题变为不含参数问题,避免了分类讨 High school stage of the comprehensive evaluation of the function of the test, many of them are consistent with the establishment of a problem and a solution to the problem, this type of problem is generally the parameter range. Generally speaking, there are two ways to solve this kind of problem: one is to classify the function with parameters and discuss it by the method of finding the most value. However, the process of general classification and discussion will be complicated. The solution of different kinds of questions also Different, sometimes the solution is rather complex and hard to imagine. The second is to separate the parameters of the method, the biggest advantage of this method is to change the parameter-free parameter problem, to avoid classification