分类讨论是中学数学的一个重要思想方法，教学中我们往往只重视对它的理论和实践的研究，而忽视了讨论结果该怎样表达，给学生的解题操作带来了一定的混乱．学生经常把不该求交的结果求交集，不该求并集的结果求并集，影响了学生的逻辑思维发展．在本文中笔者对分类讨论的... Classification discussion is an important thinking method of middle school mathematics. In teaching, we often only pay attention to its theory and practice, but neglect how to express the results of the discussion, and bring a certain confusion to students’ problem-solving operations. Students often find the intersection between results that should not be asked for, and should not seek the union of the results, which affects the development of students’ logical thinking. In this article, the author discussed the classification...