Răspuns :
XLIII=43 si XC=90 ;
XLIII×XC=43×90=3870-MMMDCCCLXX
MDCXIX=1619 si MDXL=1540
MDCXIX-MDXL=1619 -1540=79 =LXXIX
79 : LXX = 70. IX = 9
XLIII×XC=43×90=3870-MMMDCCCLXX
MDCXIX=1619 si MDXL=1540
MDCXIX-MDXL=1619 -1540=79 =LXXIX
79 : LXX = 70. IX = 9