№ 1003
а) 1 - 2/5 = 5/5 - 2/5 = 3/5
б) 1 - 7/18 = 18/18 - 7/18 =11/18
в)1 - 12/13 = 13/13 - 12/13 = 1/13
г) 1 - 2/45 = 45/45 - 2/45 = 43/45
-----------------------------------------
№ 1004
а) 12 - 1/7 = 11 + (1 - 1/7) = 11 + 6/7 = 11целых 6/7
б) 21 - 4/13 = 20 + (1 - 4/13) = 20 + 9/13 = 20целых 9/13
в) 45 - 23/43 = 44 + (1 - 23/43) = 44 + 20/43 = 44целых 20/43
г) 99 - 43/45 = 98 + (1 - 43/45) = 98 + 2/45 = 98целых 2/45