3/5 - 1/7 = 21/35 - 5/35 = 16/35
5/12 + 1/60 = 25/60 + 1/60 = 26/60 = 13/30
9/17 - 19/68 = 36/68 - 19/68 = 17/68 = 1/4
9/10 + 4/15 = 27/30 + 8/30 = 35/30 = 7/6 = 1целая 1/6
4/15 - 11/60 = 16/60 - 11/60 = 5/60 = 1/12
3/5 - 1/7 = 21/35 - 5/35 = 16/35
5/12 + 1/60 = 25/60 + 1/60 = 26/60 = 13/30
9/17 - 19/68 = 36/68 - 19/68 = 17/68 = 1/4
9/10 + 4/15 = 27/30 + 8/30 = 35/30 = 7/6 = 1целая 1/6
4/15 - 11/60 = 16/60 - 11/60 = 5/60 = 1/12