2) 3245 - MMMCCXLV
753 - DCCLIII
255 - CCLV
389 - CCCLXXXIX

3) XXXIV = 34
XXIX = 29
CLIV = 154
LXXV = 75
MDC = 1600
LIX = 59

4) по возрастанию:
DCCLVI= 756
CDXIX= 419
LXXIV= 74
XL= 40
XXV= 25