If Neijiang No.2 Middle School belongs to Neijiang City and is a city in Sichuan Province, then the common version of the textbook it uses is the textbook of the People's Education Edition, not only the math book, but also the other textbooks of the People's Education Edition.

So this PEP textbook has been used for many years and has a history of many years. Senior high school mathematics in Neijiang No.2 Middle School uses the textbook of People's Education Edition, which is not only available in senior high schools, primary schools and junior high schools, so the final conclusion is that senior high school mathematics in Neijiang No.2 Middle School uses the textbook of People's Education Edition, and it will not change in the next ten years.

Moreover, the textbook of PEP is also the most mainstream textbook in China, and many provinces and cities are using this textbook.