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1.本单元重、难点分析本单元从分类计数原理与分步计数原理入手,展开对排列组合问题及二项式定理的研究,为以后学习概率及统计打下基础.分类计数原理与分步计数原理是关于计数的两个基本定理,也是推导排列数公式和组合数公式的基础,在应用时要注意二者的区别.学习的难点是两个?
1. Analysis of the Unit’s Heavy and Difficulty This unit starts with the principles of classification and counting and the principle of step-by-step counting. It begins to study the permutation and combination problems and the binomial theorem to lay the foundation for future learning probability and statistics. Classification counting principle and step count The principle is the two basic theorems about counting, and it is also the basis for the derivation of the array number formula and the combination number formula. In application, it is necessary to pay attention to the difference between the two. The difficulty in learning is two?