个案包括三部分 :教学目标的确立 ;教学过程实录 ;对个案的分析与评价 .1　教学目标的确立数列极限的ε-Ｎ定义是学生相当难掌握的内容 ,往往需要学生在相当长的学习时间内 (甚至要到学习微积分以后 )反复体会才能加深对此概念的理解 .因此 ,一开始让学生接触数列极限的ε-Ｎ定 The case consists of three parts: the establishment of teaching objectives; the actual recording of teaching processes; the analysis and evaluation of individual cases.1 The establishment of teaching goals The definition of the ε-N limit of the sequence is a very difficult part for students to grasp and often requires students to study for a long time. In-house (even after learning calculus) repeated experience to deepen the understanding of the concept. Therefore, the beginning of the students to contact the limit of the number of ε-N