函数是高中数学的基础和主体内容,也是高中数学竞赛的重要内容.有关函数基本概念的题目,涉及的知识面广,蕴涵的数学思想方法丰富.本文将结合近年来的数学竞赛试题,介绍一些处理函数的基本概念的方法.函数的定义域、值域、对应关系是函数概念的三要素,也是竞赛命题的着眼点.例1( Function is the basis of high school mathematics and the main content of high school mathematics competition is an important part of the basic concept of the function of the topic involves a wide range of knowledge and implication of mathematical thinking and methodological rich.This article will be combined with recent mathematical contest questions, Method of dealing with the basic concepts of the function The definition of the function domain, the value of the domain, the correspondence between the concept of the three elements of the function, but also the focus of the contest proposition .Example 1 (