1, preview means reading new textbooks independently before class. By reading, analyzing and thinking, write down the problems that you don't understand in the textbook, so that you won't find it difficult in class.

2. In class, when the teacher talks about something he doesn't understand in the preview, he is very active, pays special attention to listening, and tries to understand it in class to further improve his learning ability.

Doing homework carefully is an essential part of learning mathematics knowledge well, and it is the basic method to master knowledge and skills, which can deepen the understanding of what you have learned. In the process of learning, the knowledge learned can be preserved in time through handouts, standard tests, textbooks, reference books, etc., and can be quickly recalled in later review.