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河北省临漳县第一中学高中数学选修2-3 1.1分类加法计数原理与分步乘法计数原理1学案 精品

分类加法计数原理与分步乘法计数原理(1) : 1.通过实例,总结出分类加法原理、分步乘法原理,体会归纳、概括的数学思想 2. 理解解分类、分步的特征,合理分类、分步; : 理解解分类、分步的特征,合理分类、分步 导入课题 问题 1 分类加法计数原理与分步乘法计数原理是怎样的? 问 题 2 分类加法计数原理与分步乘法计数原理有怎样的区别和联系? : 例 1 现有高一学生 9 人,高二学生 12 人,高三学生 7 人,自发组织参加社会实践活动. 选其中一人为总负责人,有多少种不同的选法? 例 2. 已知直线方程 Ax + By = 0,若从 0,1,2,3,5,7 这六个数字中每次取两个不同的 数作为 A、B 的值,则表示不同直线的条数是( ) : 1. 一个商店销售某种型号的电视机,其中本地产品有 4 种,外地产品有 7 种,要买 1 台这种 型号的电视机,有 种不同的选法. 2. 某班有男生 30 人,女生 20 人,现要从中选出男、女各 1 人共 2 人代表班级参加比赛,共 有 _______种不同选法. 3.乘积 ? a1 ? a2 ? a3 ??b1 ? b2 ? b3* ? 展开后,共有 项. 4.现有高一学生 9 人,高二学生 12 人,高三学生 7 人,自发组织参加社会实践活动. (1)每年级选一名组长,有多少种不同的选法? (2)从中推选两名来自不同年级的学生做一次活动的负责人,有多少种不同选法? 作业 P6 练习 1,2,3 精品文档 强烈推荐

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