1.本单元重、难点分析集合是高中数学的起始内容,也是现代数学的基本概念,集合的概念及其理论称为集合论,它是学习近、现代数学的基础,其基本理论和思想在后续内容的学习过程中有着广泛的应用,以集合的观点认识数学问题有利于突出问题的本质.学习的重点:集合的概念、性质和表示 1. This unit’s heavy and difficult analysis set is the starting point of high school mathematics, and it is also the basic concept of modern mathematics. The concept of set and its theory is called set theory. It is the basis for learning recent and modern mathematics, its basic theory and ideas. In the follow-up learning process has a wide range of applications, to understand mathematical problems from the point of view is conducive to highlighting the nature of the problem. The focus of learning: the concept of collection, nature and expression