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解排列组合问题 ,需首先根据题意弄清是排列还是组合问题 ,还是排列与组合混合问题 ,然后抓住问题本质 ,选择正确策略 .笔者根据自己的体会 ,结合近年高考、各地会考和模拟试题 ,将解排列组合问题常用策略例释如下 ,供参考 .1 先安排特殊元素例 1 用 0、1、2、3、4这五个数字
To solve the problem of unmarshalling and combination, you must first find out whether the questions are arranged or combined, or the problem of arrangement and combination, and then grasp the nature of the problem and choose the correct strategy. The author according to his own experience, combined with the recent college entrance examination, local exams and simulation questions , The common strategies for unmarshalling and combination problems are explained below for reference.1 First arrange special elements Example 1 Use five digits 0, 1, 2, 3, 4