作为一堂课的首要环节,让学生对一堂课产生良好的第一印象,无疑是这堂课成功的关键一步,课堂引入在形式上应体现新颖性,创设有助于学生自主学习的问题情境,激发学生的求知欲,从而创造一个有利于学生主动求知的学习环境,使学生在获得所必需的数学知识和技能的同时,在情感、态度、价值观等方面都能得到发展。 As the first link of a class, giving students a good first impression of a class is undoubtedly a crucial step in the success of this class. The introduction of class should reflect the novelty in form, create a problem situation that helps students to learn independently, Stimulate students ’thirst for knowledge, so as to create a learning environment conducive to students’ initiative and knowledge, and enable students to develop their emotions, attitudes and values ​​while acquiring the necessary mathematical knowledge and skills.