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排列组合是中学数学相对独立的内容,由于解题方法独特,结果不易验证,因而具有较强的灵活性和抽象性,在解题过程中,有几个问题极易混淆,现通过实例,加以辨明.1 分组问题分组问题是排列组合中的一个难点.主要有以下三种情况.1.1 非平均分组问题在非平均分组问题中,不管是给出组名或不给出
Arrangement and combination is relatively independent secondary school mathematics content, because the unique problem solving method, the result is not easy to verify, which has strong flexibility and abstraction, in the process of solving problems, there are several problems easily confused, through examples, to be Discern.1 Grouping problem Grouping problem is one of the difficulties in permutation combination, mainly in the following three situations.1.1 Non-average grouping problem In the non-average grouping problem, no matter whether the group name is given or not