清代华蘅芳《学算笔谈》：“名位之数，既俱可用自一至九之各数记之，则其空位当以零字记之，或作一圈以代零字亦可。”

来源: chufang 于 2023-08-30 11:02:53 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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