Jiangsu, Hunan, Shanghai, Chongqing and so on. According to the inquiry of official website of East China Normal University, the first volume of the seventh grade electronic textbook of Mathematics East China Normal University Edition is a high-definition electronic course for mathematical figures in the junior middle school textbook area created by East China Normal University. By July 28th, 2023, * * * has been used in 23 regions, including Jiangsu, Hunan, Shanghai, Chongqing, Jinhua, Zhejiang, Hohhot, Baotou and Inner Mongolia.