分类讨论的思想是将一个较复杂的数学问题分解成若干个基础性问题,通过对基础性问题的解答来解决原问题的策略.实质上,分类讨论思想是“化整为零,各个击破,再积零为整”的数学策略,对发展人的逻辑思维有着重要的帮助.在分类讨论时,需要遵循如下的原则:分类的对象确定,标准统 The idea of ​​category discussion is to break down a more complex mathematical problem into a number of basic problems, and to solve the problem of the original problem through the solution to basic problems. In essence, the idea of ​​classification and discussion is that , And then zero zero is the whole "mathematical strategy, the development of human logical thinking is an important help in the classification of discussion, the need to follow the following principles: classification of the object to determine the standard system