分类讨论的方法是解数学题的基本思想方法之一，在解题中的运用十分广泛，有必要牢固地掌握．然而，分类讨论的过程一般都冗长，同时在完备性方面易造成失误，因此，有必要研究简化甚或回避分类讨论的技巧，以达到开拓思路、简捷解题的目的．本文举例说明若干有关的技巧以... The method of classification and discussion is one of the basic methods of solving mathematics problems. It is widely used in problem solving and it is necessary to firmly grasp. However, the process of classification and discussion is generally lengthy, and at the same time, it is easy to make mistakes in terms of completeness. Therefore, it is necessary to study the techniques of simplifying or even avoiding classified discussion so as to achieve the purpose of opening up the ideas and simplifying the problem. This article illustrates some of the relevant tips to...