Răspuns :
C+XXV=100+25=125 CXXV
D+IX=500+9=509 DIX
XXIX+XX=29+20=49 XLIX
DCCVII-CC=707-200=507 DVII
D-L=500-50=450 CDL
MDCI-MC=1601-1100=501 DI
MCMLXXXIX-XXXIX=1989-39=1950 MCML
MCMXCIX-IX=1999-9=1990 MCMXC
D+IX=500+9=509 DIX
XXIX+XX=29+20=49 XLIX
DCCVII-CC=707-200=507 DVII
D-L=500-50=450 CDL
MDCI-MC=1601-1100=501 DI
MCMLXXXIX-XXXIX=1989-39=1950 MCML
MCMXCIX-IX=1999-9=1990 MCMXC
100+25=125; 500+9=509; 29+20=49; 707-200=507; 500-50=450;1601-1100=501; 1989-39=1950; 1999-9=1990