For example, in Zhengzhou, Jinshui District, the sixth grade mathematics textbook was published by Beijing Normal University, and other districts were published by the Ministry. There are many versions of mathematics textbooks, except Beijing Normal University Edition and Ministry Edition, as well as Jiangsu Education Edition and Hebei Education Edition. Therefore, if you want to know which version of the sixth grade mathematics textbook to use, you need to know which city you are from first.