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以实际例子说明数学解题中分类讨论的原因、分类方法、分类讨论的作用,并小结分类讨论时应注意的几个要点。
A practical example is given to illustrate the reasons for classification, the classification method, the role of classification and discussion in the mathematical problem solving, and summarize several points that should be paid attention to when discussing classification.