きょうかしょ教科書kyoukasho
1.

A written resource used in educational settings, specifically designed to provide structured content for subjects taught in schools, encompassing various topics and educational objectives.

2.

A central book that serves as the primary material for teaching and learning particular subjects, often organized according to an established curriculum.

3.

A guide designed for students that includes explanations, exercises, and information necessary for understanding specific academic disciplines, commonly utilized in formal education environments.

Example:

教科書はどうしたらいいんでしょうか。