The charge is different. Mathematics in the old Tang Dynasty generally charged according to class hours, and different subjects charged differently. Laotang Mathematics is a brand of mathematics subject under Sichuan Zhiboxin Education Consulting Service Co., Ltd., and its lecturers are all well-known domestic lecturers. Provide online course counseling for high school students, mainly with teacher Tang Chuanhong. Tang Chuanhong is the author of Derivative/Decisive Breakthrough of Mathematics in College Entrance Examination. Since its establishment, Laotang Mathematics has been committed to breaking the traditional teaching mode. "Personalized customization" aims at the different situations of each student, customizes the exclusive learning plan and provides targeted counseling.