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分类讨论思想就是按照一定的标准,把研究对象分成为数不多的几个部分或几种情况,然后逐个加以解决,最后予以总结作出结论的思想方法,它是中学数学中常用的一种数学思想方法
The idea of categorical discussion is to divide the research object into a few parts or several cases according to a certain standard and then to solve them one by one, and finally to conclude the thinking method of concluding a conclusion, which is a kind of mathematics commonly used in middle school mathematics Way of thinking