易算盤 巧妙的 三根 活樑

易算盤有50種不同盤面排列,
且有無限多個進位制的展現,
靠數學智慧及因人而異的啟發,,, Easyabacus to calculate there are 50 different disk arrangement,
And there are unlimited number of carry system show,
Rely on mathematical wisdom and inspiration from person to person,,,