1, scene import. Situational introduction is a common method. At the beginning of the class, the teacher plays some meaningful pictures, soothing music to attract students' attention, so that students can enter the situation set by the teacher well, exert their imagination, and let students enter the learning state quickly. This way of introduction can effectively transfer students' thoughts and feelings to study, make students feel calm, and is more conducive to students entering the state of classroom learning. What's important is that the scene lead-in must conform to the students' reality and be targeted, and effectively combine the lead-in content with the teaching content to stimulate students' thinking to the greatest extent, so that students can get out of boring mathematics learning and stimulate their learning motivation and knowledge-seeking psychology.

2. Story import. The method of story introduction is that the teacher quotes some famous allusions in the lecture, so that students can concentrate more, increase the interest of the class, admire the characters in the story, and stimulate students' learning motivation. For example, when talking about the abstract concept of pi, we can introduce the story of mathematician Zu Chongzhi, so that students can have a better understanding of pi and master it flexibly.

At the same time, students can learn about mathematicians in China, learn the indomitable spirit of mathematicians, and establish the determination to study hard. The introduction of this method can not only make students concentrate on their studies, but also enable them to learn more extracurricular knowledge and enrich their knowledge. At the same time, teachers have better ways to solve the knowledge that can't be expressed in words and successfully complete the teaching task.

Learn new things by reviewing the old ones. The introduction method of reviewing past knowledge is the so-called recall method of what you have learned before the new lesson. The teacher asks students questions at random, which is indirectly related to the knowledge to be learned. This not only reviews the knowledge learned in the past, but also enables students to fully understand the new knowledge, killing two birds with one stone. In addition, it also allows students to have more thinking space, regain their lazy mentality in the shortest time and enter the classroom learning state, which can effectively concentrate students' attention. This method has the advantages of conciseness and to the point, and is deeply loved by teachers, because teachers think that this method can review the past and learn new things, so that students can make full use of their study time, effectively remember key and difficult knowledge, and also make effective use of classroom time.