A reference book explaining mathematical concepts in words to deepen understanding. No writing inside! Price: 1800 yen ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ I also have many other reference books for university entrance exams! I will offer a discount for bulk purchases! (Number of books × 100 yen off) (Example) 2 books: 200 yen off 3 books: 300 yen off 4 books: 400 yen off... ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ Thank you for looking.