The USSR Olympiad Problem Book: Selected Problems and Theorems of Elementary MathematicsЭлектронная книгаThe USSR Olympiad Problem Book: Selected Problems and Theorems of Elementary MathematicsавтораD. O. ShklarskyРейтинг: 4 из 5 звезд4/5Сохранить The USSR Olympiad Problem Book: Selected Problems and Theorems of Elementary Mathematics на потом