在研究与解决数学问题时,根据数学对象的本质属性的相同点和不同点,将对象区分为不同种类,然后逐类进行研究与解决,从而达到研究与解决问题的目的,这一思想方法我们称之为“分类讨论”的思想方法．历年高考题中都有部分题目需要用分类讨论的思想方法去求解． When researching and solving mathematics problems, according to the same points and different points of the essential attributes of mathematical objects, the objects are divided into different types, and then research and solution are carried out class by class, so as to achieve the purpose of research and problem solving. This way of thinking we Call it the “discussion discussion” method. There are some topics in the college entrance examination questions over the years that need to be solved by the ideological methods discussed in the classification.