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分类讨论思想是中学数学的基本思想之一,对于不同性质的问题要用不同的知识、不同的方法去解决,其实质就是“化整为零,各个击破,再积零为整”.用分类讨论的思想解决问
The idea of classification and discussion is one of the basic ideas of middle school mathematics. To solve problems of different natures, different knowledge and different methods are used to solve them. The essence of this is that “the whole is divided into zeros, and each breaks and zeros into whole”. Solve the problem with the ideas of the classification discussion