论文部分内容阅读
排列、组合是两类特殊而重要的计数问题,而解决他们的基本思想和工具就是两个计数原理。教科书从简化运算的角度提出排列与组合的学习任务,通过具体实例概括得出排列、组合的概念,应用分步乘法计数原理得出排列数公式,应用分步计数原理和排列数公式推出组合数公式,对于排列与组合,有两个基本的思想基本想法贯穿始终,一是根据一类问题的特点和规律寻找简便的计数方法,二是注意应用两个计数原理思考和解决问题。
Arrangement, combination of two types of special and important counting problems, and to solve their basic ideas and tools is the two counting principle. Textbooks from the perspective of simplifying the operation of the arrangement and combination of learning tasks, through the specific examples summarized arrangement, the concept of combination, the use of step-by-step multiplication of the counting principle to calculate the number of arrangement, the use of counting principle and the number of permutations introduced number of combinations Formula, there are two basic ideas for permutation and combination throughout, one is to find a simple counting method according to the characteristics and laws of a type of problem, and the other is to pay attention to using two counting principles to think and solve the problem.