分类讨论的方法是初中数学中重要的数学思想方法 ,学习分类讨论方法 ,其作用是克服思维的片面性和局限性 ,培养学生思维的严密性 .从而做到正确解题 .要做到成功地进行分类 ,关键要注意两点 ,一是要有强烈的分类意识 ,善于从问题情境中抓住分类的对象 ;二是要斟酌问题的实际情 The method of classification and discussion is an important method of mathematics in junior high school mathematics. It is a method of classifying and discussing methods. Its role is to overcome the one-sidedness and limitations of thinking, and to cultivate the rigor of students’ thinking, so as to solve the problem correctly. To do it successfully. Classification, the key to pay attention to two points, one is to have a strong sense of classification, good at grasping the object of classification from the problem situation; the second is to consider the actual situation of the problem