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- Abacus - Simple Soroban Abacus
- iOS アプリ: 教育 作者: Switt Kongdachalert
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- ポイント: 1 + 10 (2.6) バージョン: 1.1 A simple soroban abacus that also shows the number representing the value of each column. An abacus is a tool that has been used since ancient times to calculate. Calculations with ... ⥯
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