极限概念是整个数学中最重要的概念之一,它也是学生难以接受的概念之一。不但如此,困难还表現在下面的問題上:“在学生的現有知識水平上按什么样的严格程度来給出极限的概念”?簡单地說来,这是好的教师不必把該說的都全部說出来也能把它讲好的概念之一。在《委員会报告》中极限概念是在《中学九年級的数学》中第一次遇到的,因此让我們从研究級数 The concept of limit is one of the most important concepts in mathematics. It is also one of the concepts that students find difficult to accept. Not only that, but the difficulty is also reflected in the following question: “What is the strict degree of the student’s current knowledge to give the concept of limits?” Simply put, this is a good teacher does not have to say All speak out and one of the concepts that can tell it well. The concept of limit was first encountered in the Mathematics of Grade 9 in Middle School in the “Report of the Committee”, so let’s start with the study series.