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liczby przeciwne
-3 1/3 = 3 1/3
0,8 = -0,8
1 = -1
-1,25 = 1,25
liczby odwrotne
-3 1/3 to inaczej -10/3 = -3/10
1 = 0,1
8/10 = 10/8
5/4 = 4/5
zad.2
DCCXIV =714
; CMLXXX =980
; MDCCX =1710
MCMLIX =1959
zad.3
492 =CDXCII
, 1319 MCCCXIX
, 2047 MMXLVII
, 3924 MMMCMXXIV