清虛勾股數
清虛勾股數
丿乙卯己口囗田田三四五六七八九十百千万厂，丿刁乙夕厘分刄斤錢。
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Text and scans: Shidian Guji (Peking University – ByteDance open ancient texts). Edition details are given per book. Shidian Guji
授時曆要法
清虛勾股數
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