函数定义域是函数概念的重要组成部分,它不仅是研究函数图象和性质的基础,而且在很多数学问题的求解过程中,往往能够显示出不可低估的特殊作用。一、导向功能函数的定义域对许多问题的求解,有着明显的导向功能,优先考虑定义域,有助于启迪思路,理顺解题 The function definition domain is an important part of the concept of the function. It is not only the basis for studying the image and properties of the function, but also can show the special effects that cannot be underestimated in the process of solving many mathematical problems. First, the domain of the guide function function solves many problems, has a clear guiding function, give priority to the definition of the domain, help to inspire ideas, rationalize problem solving