1, school or educational institution, contact your school or educational institution and ask whether to provide electronic textbooks or permission for reading textbooks on electronic devices.

2. Visit some legal education resource platforms, such as online education platforms provided by schools or education departments, and provide electronic teaching materials for students to use.

3. Go to the local library to see if there is a paper version of the first volume of the ninth grade mathematics textbook, or the library will provide electronic version of the textbook for reference.