К) 3 3/10 - 7/10 = 33/10 - 7/10 = 26/10 = 2 6/10 = 2 3/5
О) 8 3/35 - 5 4/5 = 8 3/35 - 5 28/35 = 7 38/35 - 5 28/35 = 2 10/35 = 2 2/7
И) 1 2/3 + 3 7/39 = 1 26/39 + 3 7/39 = 4 33/39 = 4 11/13
Н) 6/7 + 1 4/7 = 1 10/7 = 2 3/7
А) 2 4/5 + 1 4/9 = 2 36/45 + 1 20/45 = 3 56/45 = 4 6/45