Tsinghua attached elementary school math exercise book. By querying the information display of an icon rocket on the paper, we can know that the tutorial book is a book to assist and guide learning, mainly for students, trainees and other people who need help and guidance. There is a rocket symbol on the page number of the math workbook attached to the primary school in Tsinghua, which can make students know more about the textbook knowledge, and the fields involved often go beyond the textbook content.