函数是高中数学的重要内容和后继学习的必备知识,而与此同时,它也是许多同学数学学习的难点、障碍。怎样才能突破函数学习关呢?函数有三个要素:定义域,对应关系,值域。定义域是函数赖以变化的基础,对函数的图像和性质有制约作用。掌握好这一点,对搞好函数学习,至关重要。 Function is an important part of high school mathematics and the necessary knowledge of subsequent learning, but at the same time, it is also a difficult and obstacle for many students in maths learning. How can we break through the function of learning off? Function has three elements: domain, correspondence, range. Domain is the basis for the function to change, the function of the image and the nature of constraints. Grasp this point, it is crucial to improve the function of learning.