论文部分内容阅读
这三部分内容,具有内容独特、比较抽象的特点。我们在指导学生复习时,应从学生的实际出发,紧扣基本概念、基本知识、基本思想方法,着眼于能力的培养。由于组合恒等式的证明贯穿整章,又是难点,可作为专题,集中于最后一起复习。一排列与组合本章主要内容有:两个基本原理(加法原理和乘法原理);两个基本概念(排列、组合);两个基本公式(排列与组合的计算公式);还有组合数的两个性质,排列组合应用题。这四个“两”是教材的重点,而解应用题是难点。通过复习,引导学生进一步掌握好以下几个环节。 1 扣住原理,把握“四个分”。加法原理和乘法原理是解排列、组合应用题的基础。只有
These three parts have unique and abstract features. When we are instructing students to review, we should proceed from the students’ actual conditions, closely follow the basic concepts, basic knowledge, basic thoughts and methods, and focus on the cultivation of abilities. As the proof of combinational identity runs through the whole chapter, it is also a difficult point and can be used as a topic to focus on the final review together. An arrangement and combination The main contents of this chapter are: two basic principles (additional principle and multiplication principle); two basic concepts (arrangement, combination); two basic formulas (arrangement and combination calculation formulas); and two combinations of two Nature, permutations and combinations of applications. These four “two” are the focus of the teaching materials, and solving the application questions is a difficult point. Through review, guide students to further grasp the following aspects. 1 Hold the principle and grasp the “four points.” The principle of addition and principle of multiplication are the basis for solving the problems of arrangement and combination. only