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Lecture on "Old Tang Mathematics": Tang Chuanhong, a native of Sichuan, is a science student of Sichuan University. At that time, the score of the college entrance examination was 146, and Lao Tang himself began to study college entrance examination mathematics from college. When he was studying at Sichuan University, he began to walk in the "rivers and lakes" of education and devoted himself directly to the education industry after graduation. After ten years of grinding a sword, the research on the marking skills of the college entrance examination in the past ten years has made Lao Tang's original leverage problem-solving method, and its derived Taoism has been sought after by famous students. 20 19 online class, the average score of college entrance examination 135, the highest score 149. In addition to attending classes, the most common thing to communicate with classmates is to compete for pictures. He was also forced to become a "network celebrity" teacher because of his relaxed and humorous teaching content.