Beijing normal university edition. In order to improve the quality of mathematics teaching in Xiaoxian primary school, the school organizes primary school mathematics to use the textbooks of Beijing Normal University one after another, which is more comprehensive. Xiaoxian County is a county under the jurisdiction of Suzhou City, Anhui Province. It is the sub-central city of Xuzhou metropolitan area, located at the northern gate of Anhui Province and the suburb of Xuzhou, and at the center of the Yangtze River Delta and Huaihai Economic Zone.