函数定义域是函数解题过程中的一个重要环节,高考对函数定义域一般不单独考查,而常常是通过函数性质或函数应用来体现,具有一定隐蔽性.因此,在研究函数问题时,必须树立“定义域优先”的观点,牢牢把握定义域是解决所有函数问题要考虑的先决条件.下面通过具体实例归纳函数定义域的常见类型的求法. The function definition domain is an important part of the function problem solving process. The college entrance examination generally does not examine the function definition domain separately, but often it is represented by the function property or function application. It has certain concealment. Therefore, when studying the function problem, it must be To establish the concept of “domain priority”, firmly grasp the definition domain is a prerequisite for solving all function problems. The following examples are used to generalize the common types of function definition fields.