关于总复习中分类讨论思想的教学沈倩文（江苏省连云港市职教中心２２２００１）１明确分类讨论的必要性当问题中含有变化不定因素，且直接影响解题进程或影响完整结论的取得时，必须进行分类讨论．例１设集合；从集合Ａ中取出三个元素，使其和能被３整除，一共有多少种不... On the Teaching of Classification Review in General Review Shen Qianwen (Lianyungang City Vocational Education Center, Jiangsu Province, 222001) 1 The necessity of clear classification and discussion When problems contain uncertainties in the changes and directly affect the process of solving problems or affecting the complete conclusions, they must Conduct classified discussion. Example 1 set the collection; take three elements from the set A, and make it can be divisible by 3, how many do not have a total of...