分类讨论题覆盖的知识点较多,有利于考查学生的知识面、分类思想和解题技巧,同时方式多样,具有较高的逻辑性和较强的综合性.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、不遗漏地分析讨论”。 Classification of topics covered more knowledge points, is conducive to examine the students knowledge, classification ideas and problem-solving skills, at the same time a variety of ways, with high logic and strong comprehensive .To establish the classification of thinking, should pay attention to understanding And to grasp the principles, methods and techniques of classification, to “determine the object of the whole, a clear classification criteria, stratification is not repeated, without omission to analyze the discussion.”