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每次看到羅馬數字們，就會霧沙沙。做個小列表，放在網誌上給自己參考一下好了。

I = 1
V = 5
IV = 5 - 1 = 4
VI = 5 + 1 = 6


 
X 10
IX = 10 - 1 = 9
XI = 10 + 1 = 11
(VX = 10 - 5 = 5, 事實上沒有)
XV = 10 + 5 = 15



L 50
(IL = 50 - 1 = 49, 應該表示為 XLIX)
LI = 50 + 1 = 51
(VL = 50 - 5 = 45, 應該表示為 XLV)
LV = 50 + 5 = 55
XL = 50 - 10 = 40
LX = 50 + 10 = 60

可參考: http://en.wiktionary.org/wiki/Category:Roman_numerals






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