Useful. Learning and thinking is a giant in the field of mathematics teaching and training, and it is well known. This large institution has published a very popular and best-selling set of mathematics, The Secret Book of Learning and Thinking, which has sold 3 million copies. The official introduction of this set of books is that learning while thinking is 12' s original mathematical thinking system, which was created by famous domestic mathematical experts. Therefore, it is useful for senior one to learn to think about mathematics.