What Should be Subtracted from DXIX to Get XXI? First, we will write DXIX and XXI in numbers, i.e. DXIX = 500 + 10 + 9 = 519 and XXI = 20 + 1 = 21. Now, 519 - 21 = 498. And 498 = CDXCVIII. Therefore, CDXCVIII should be subtracted from DXIX roman numerals to get XX...
复制 I-1unusII-2duoIII-3tresIV-4quattuorV-5quinqueVI-6sexVII-7septemVIII-8octoIX-9novemX-10decemXI-11undecimXII-12duodecimXIII-13tresdecimXIV-14quattuordecimXV-15quindecimXVI-16sedecimXVII-17septendecimXVIII-18duodevigintiXIX-19undevigintiXX-20vigintiXXI-21viginti unusXXII-22viginti duoXXVII...