恒成立问题是高考热点题型之一,它主要涉及一次函数、二次函数等函数的性质、图像,渗透着换元、化归、数形结合、函数与方程等思想方法,在培养思维的灵活性、创造性等方面起到了积极的作用.高考中的恒成立问题形式多样化,但都与函数、导数知识密不可分.以下我就结合例题浅谈恒成立问题的常见解法.类型一、转化为二次函数问题 It is mainly concerned with the nature and image of the functions such as the first order function and the quadratic function. It infiltrates the ways of thinking, such as changing yuan, combining with numbers, combining functions and equations, in cultivating the thinking Flexibility, creativity, etc. There are various forms of constant establishment in college entrance examination, but both are inextricably linked with the function and derivative knowledge.In the following, I will discuss the common solutions to the problem of constant establishment with examples. For the quadratic function problem