函数零点个数问题是函数应用的一个方面,也是高考中的常见题型.它不仅可以考察基本的数学知识,还可以考察基本的数学思想方法,比如转化与化归,数形结合,分类讨论,整体代换等等.能否成功的解决相关问题,可以反映出学生是否具有思维的创造性和灵活性.因此这类题,在各种考试中经常出现.对于一些简单的函数,可结合函数图像或对应方程的实根的个数进行判断,本文主要针对的是一些 Function zero number problem is one aspect of the function application, but also a common problem in college entrance examination. It can not only examine the basic mathematical knowledge, you can also examine the basic mathematical thinking and methods, such as transformation and transformation, the number of forms of combination, classification discussion , The overall substitution, etc. The success of the solution to the problem can reflect whether the students have the creative thinking and flexibility.Therefore, these kinds of questions, often appear in various exams.For some simple functions, combined with the function Image or the number of real roots corresponding to the equation to judge, this article is for some