分类讨论是解决问题的一种逻辑方法,也是一种数学思想.这种思想对于简化研究对象,发展人的思维有着重要帮助,因此,有关分类讨论的数学命题在高考试题中占有重要位置.所谓分类讨论,就是当问题所给的对象不能进行统一研究时,就需要对研究对象按某个标准分类,然后对每一类分别研究最后综合各类结果得到整个问题的解答.实质上, Category discussion is a kind of logical method to solve the problem, and also a kind of mathematical thought, which is of great help for simplifying the research object and developing human thinking. Therefore, the mathematical proposition about classification discussion occupies an important position in the entrance examination questions. Category discussion, that is, when the problem given to the object can not be a unified study, you need to classify the study according to a standard, and then for each category were the final study of the various types of results to get the answer to the entire problem.In essence,