Mathematics in Sihong Junior High School is a Su Ke version, and Sihong County, Suqian City, Jiangsu Province is a compulsory education. However, according to the list of textbook versions of all subjects in the seventh grade of compulsory education in Jiangsu Province, junior high school mathematics is the Suke version published by Jiangsu Science and Technology Publishing House. Therefore, the mathematics of the first day of Sihong is the Su Ke version.