1结构严谨,内容丰富,瞻前顾后一节好课好似一本书,一出戏,非常讲究整体的结构。我们感到张老师的这节课就具有这方面特点:结构严谨,内容丰富,瞻前顾后。本节课的核心内容只有一个,即函数的定义。教者从定义出发,将触角伸向四面八方,引发出丰富多彩的内容,且毫不杂乱。在研究这些问题的过程中,又都指向函数的定义,先发散,后敛聚,给人以统一的 A structured, content-rich, looking forward to a good course is like a book, a play, very particular about the overall structure. We feel this lesson of Teacher Zhang has the following features: a rigorous structure, rich content, looking forward. The core of this lesson is only one, the definition of function. Starting from the definition, the teacher extends the tentacles in all directions and leads to a rich and colorful content without clutter. In the process of studying these issues, they all point to the definition of function, divergent first, then convergence, giving a unified