分类讨论是重要的数学思想方法,在解题或实际生活中,判定两个三角形相似,有时因对应顶点、对应角、对应边等不能惟一确定,常需分类讨论,否则会造成漏解,以偏盖全,本文举例说明. Classification discussion is an important mathematical thinking method. In solving problems or real life, it is determined that two triangles are similar. Sometimes the corresponding vertices, corresponding angles, corresponding edges, etc. cannot be uniquely determined, and classification discussions are often needed. Otherwise, it will cause leakage. Cover all, this article illustrates.