The Fundamental Operations in Bead Arithmetic - How to Use the Chinese AbacusЭлектронная книгаThe Fundamental Operations in Bead Arithmetic - How to Use the Chinese AbacusавтораKwa Tak MingРейтинг: 5 из 5 звезд5/5Сохранить The Fundamental Operations in Bead Arithmetic - How to Use the Chinese Abacus на потом