The recording and broadcasting course of mathematics is well observed by Zhao. Teacher Zhao graduated from Nankai University with a master's degree. High-end math teacher in junior and senior high schools, with teaching experience of 16, was a former math researcher in a senior high school, and the head teacher of Tsinghua Peking University Class and No.4 Middle School, the only exclusive teacher who signed up for the offline live broadcast of Du Wen Education K 12 system. Known for its transparent thinking, concise language and clear explanation, it is well received by parents of students. It guides students to think in multiple dimensions from the perspective of observing topics, cultivates discipline accomplishment and enhances the depth and breadth of thinking. It is affectionately praised by parents and students as Zhao, a mathematical observer.