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“分类”，是从比较派生出来的一种逻辑思维活动。在初中数学教材中，对干数在有理数、实数等不同数域中的分类，几何图形按形状、大小和位置关系中某种条件的分类等，都是较为重要的内容。因概念模糊而分类不清，会严重影响学生运算和证题的正确性。因此，搞好分类教学是培养
“Classification” is derived from the comparison of a logical thinking activity. In junior high school mathematics teaching materials, it is more important for the classification of dry numbers in rational numbers, real numbers and other different numbers of fields, the classification of geometrical figures by some condition in shape, size and position relationship. Due to ambiguity of the concept and classification unclear, will seriously affect the correctness of student operations and the title. Therefore, to improve classification teaching is to cultivate