分类讨论思想就是根据所研究对象的性质差异,分各种不同的情况予以分析解决.分类讨论题覆盖知识点较多,利于考查学生的知识面、分类思想和技巧;同时方式多样,具有较高的逻辑性及很强的综合性,树立分类讨论思想,应注重理解和掌握分类的原则、方法与技巧、做到“确定对象的全体,明确分类的标准,分层别类不重复、不遗漏的分析讨论.” The idea of ​​classification and discussion is based on the nature of the object being studied and analyzed and resolved in various situations. The classification and discussion topics cover more knowledge points, which facilitate the examination of students’ knowledge and classification of ideas and techniques; Logic and strong comprehensiveness, set up the idea of ​​classified discussion, should pay attention to understanding and mastering the principles, methods and techniques of classification, and achieve the goal of “determining the whole of the object, clarifying the classification criteria, and not classifying different types of classifications. Missing analysis discussion."