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函数是中学数学一块非常重要的知识,在高考中函数的内容也占了很大的比重.函数的定义域是函数三要素之关键,也是我们研究函数问题的出发点,它在解决与函数有关的一些题目中起着十分重要的作用.本文通过几个具体的实例来说明平时研究函数问题应注意函数的定义域.
Function is a very important knowledge of high school mathematics, the content of the function in the college entrance examination also accounted for a large proportion of the function domain is the key to the three elements of the function, but also our starting point for the study of function problems, In some topics plays a very important role.This paper through several specific examples to illustrate the normal study of the function of the problem should pay attention to the domain of the function.