我小時候學算盤時有類似的疑問，為什麽要有頂珠呢？去掉頂珠對運用沒有影響。日本算盤沒見過。

來源: 欲千北於 2020-12-11 21:36:38 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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