Thank you for viewing. This is an explanation book (containing explanations of examples, answers to practice problems, etc.) for the System Mathematics 1 (Algebra Edition) textbook published by Kenkyu Shuppan. - Title: System Mathematics 1 Algebra Edition Perfect Guide - Edition: - - Accessories: - - Contents: Helps deepen understanding of the Kenkyu Shuppan System Mathematics 1 Algebra Edition textbook. - Publisher: Kenkyu Shuppan - Price: 2013 yen (tax included) I bought this when my child first entered junior high school, thinking it could be used as a supplementary material for the textbook. I think it's a necessary material for children who solve practice problems at home (for previewing). Please understand that this item has been stored at home.