Diandian is a famous supplementary teaching material edited by Rong and has become one of the favorite teaching materials for teachers, parents and students. Annual sales hit a record high.

The middle point of the book is an auxiliary exercise around textbook analysis. If you have any questions you don't understand or understand in class, you can refer to the middle point of the book first.

The points in the book are equipped with various exercises, with accurate explanations, classic topics, flexible angles and prominent knowledge points. It contains special final training papers and scientific division modules, which conform to the rules of final review and examination and help students to systematically integrate and review their knowledge.