分类讨论问题是一种常见的数学问题,也是学生容易出错的一种问题.只要让学生在平时的训练中对需用分类讨论的问题慎重对待、总结方法,进行有效训练,逐渐掌握分类标准,就可做到不重复、不遗漏.用日本数学家米山国藏的一段有关分类讨论的话引出分类讨论方法解决问题的步骤: Classification discussion is a common math problem, but also a student error-prone problem as long as the students in the usual training on the need to categorize the issues to be treated with caution, summarize methods, effective training, and gradually grasp the classification criteria, You can do not repeat, do not miss using the Japanese mathematician Mishan possession of a class of discussion led to classification discussion method to solve the problem steps: