一、引言我们在日常生活中时常要与函数打交道,例如描述经济与人口的增长、气候的变化等等.毫不夸张地说,除了集合的概念,函数的概念或许是现代数学中用得最广泛的一个.事实上,早在十九世纪,德国著名数学家菲利克斯·克莱因就强烈主张在教学中要突出函数的概念.函数的概念在高中数学中不仅是重点也是难点之一,且不易理解与把握,这给教师教学带来了一定的挑战性.在笔者看来,主要的困难点在于如何理 I. INTRODUCTION We often deal with functions in our daily life, such as describing economic and population growth, climate change, etc. It is no exaggeration to say that except for the notion of set, the concept of function may be the most used in modern mathematics In fact, as early as the 19th century, the famous German mathematician Felix Klein strongly advocated in teaching to highlight the concept of function in high school mathematics is not only the concept of one of the key and difficult , And not easy to understand and grasp, which gives teachers a certain degree of challenge teaching in my opinion, the main difficulty lies in how to manage