г) 8 1/12 - 3 4/15 - 1 7/30

8 5/60 - 3 16/60 - 1 14/60 = (8 - 3 - 1) + (5 - 16 - 14)/60 = 4 + (-25)/60 = 4 - 25/60 = 4 - 5/12 = 48/12 - 5/12 = 43/12