分类讨论是一种重要的数学思想方法,是历年高考的重点与热点,也是高考的一个难点。在2008年全国总共37份文理高考数学试卷中涉及到分类讨论思想的共有二十几份。分类讨论有关题目的解题步骤分为四个,分别是:(1)确定讨论对象;(2)进行科学分类.分类时,应不重复,不遗漏;(3)逐类讨论;(4)归纳小结,整合得出结 Category discussion is an important method of mathematics, college entrance examination over the years is the focus and hot spots, but also a difficult college entrance examination. In 2008, a total of 37 liberal arts college entrance examination mathematics papers involved in the discussion of the concept of a total of more than two dozen. Category discussion The problem solving steps are divided into four parts, namely: (1) to determine the object of discussion; (2) for scientific classification, classification should not be repeated without omission; (3) class by case discussion; (4) Summarize the summary, the integration concluded