函数的定义域是构成函数的3个要素之一,是函数的基础,它对函数的性质起着制约作用.在函数定义域的学习中,同学们不仅要会求函数的定义域,还应明确定义域对函数性质的制约作用,树立定义域的应用优先的意识. The domain of a function is one of the three elements that make up the function, and it is the basis of the function. It plays a role in controlling the nature of the function. In the function definition domain, the students must not only ask for the domain of the function, but also Clearly define the constraints of the domain on the nature of the function and establish the application-priority awareness of the domain.