1 янв 500 г. до нашей эры - Abacus
Описание:
What: A manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame.How: You move the beads to calculate basic math
Добавлено на ленту времени:
Дата:
1 янв 500 г. до нашей эры
Сейчас
~ 2527 г назад