分类讨论思想是根据数学对象本质属性的相同点和不同点,确定划分标准,进行分类,然后对每一类分别进行求解,并综合得出答案的一种数学思想,分类中要求始终使用同一标准,做到不重复、不遗漏、有次序.分类讨论思想在高中数学中占有很重要的地位,是培养同学们具有严密的逻辑思维的重要手段,也是高中数学学习的一个难点,初学者往往出现的错 The idea of ​​classification and discussion is based on the same points and different points of the essential properties of mathematical objects, determining the criteria for classification, classifying them, and then solving each class separately, and synthesizing the mathematical ideas of the answers. The classification requires that the same standard be used at all times. , do not repeat, do not miss, there is an order. Classification of ideas in high school mathematics occupies an important position, is an important means to cultivate students with strict logical thinking, but also a difficult point for high school mathematics learning, beginners often appear Wrong