分类讨论,就是在研究和解决数学问题时,当问题所给的对象不能统一研究和解决时,我们就需要根据数学对象本质属性的相同点和不同点,将对象区分为不同种类,然后逐类对其研究和解决,最后综合各类结果,得到整个问题的解答.这种思想方法,我们称之为“分类讨论思想”.它是数学中一种重要的解题思想,是逻辑思维、理性思维能力高低的体现.有人说,会分类的人容易当上CEO,这说明学会了分类,不 When we discuss and solve mathematical problems, we can classify the objects into different categories according to the similarities and differences of the essential attributes of the mathematical objects when the objects given by the problems can not be studied and solved uniformly. Its research and solution, and finally all kinds of results, get the answer to the entire problem.This method of thinking, we call it “classification of thinking” .It is an important problem-solving thinking in mathematics, is a logical thinking , Reflecting the level of rational thinking Some people say that people who will be classified easily CEO, indicating that the classification learned, not