集合是高中数学中最基本而又重要的基础知识,有关集合的问题往往具有概念性强、涉及面广、解法灵活等特点.由于以上特点,同学们初学时常会出现各种错误,本文在归纳这些错误的基础上,着重提出四类错误率极高的问题,以引起同学们的注意. Collections are the basic and important basic knowledge in high school mathematics. Problems relating to collections are often characterized by strong concepts, wide coverage, and flexible solutions. Due to the above characteristics, students often begin to make mistakes when they begin to learn. On the basis of these mistakes, four types of questions with extremely high error rates are highlighted to draw the attention of the students.