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關注：1
2013-05-23 12:21
求翻譯：By the fourth century BC counting boards were used for calculating, which effectively meant that a decimal place valued number system was in use.是什么意思？ 待解決
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- 離問題結束還有
By the fourth century BC counting boards were used for calculating, which effectively meant that a decimal place valued number system was in use.
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