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分类讨论思想是在对数学对象进行分类的过程中寻求解答的一种思维方法。分类讨论既是一个重要的数学思想,又是一个重要的数学方法。其作用在于
The idea of classifying and discussing is a way of thinking to seek answers in the process of classifying mathematical objects. Classification discussion is not only an important mathematical idea, but also an important mathematical method. Its role is