А) 1 - 7/9 = 9/9 - 7/9 = 2/9
б) 1 - 5/12 = 12/12 - 5/12 = 7/12
в) 7 - 2/5 = 35/5 - 2/5 = 33/5 = 6 3/5
г) 3 - 1 5/6 = 3 - 11/6 = 18/6 - 11/6 = 7/6 = 1 1/6
д) 1 3/10 - 7/10 = 13/10 - 7/10 = 6/10
е) 4 9/17 - 3 12/17 = 77/17 - 63/17 = 14/17
ж) 3 2/9 - 2 5/9 = 29/9 - 23/9 = 6/9 = 2/3
з) 8 - 5 4/7 = 8 - 39/7 = 56/7 - 39/7 = 17/7 = 2 3/7
и) 4 3/8 - 2 5/8 + 3 7/8 = 35/8 - 21/8 + 31/8 = 45/8 = 5 5/8
к) 5 4/9 + 1 2/9 - 4 7/9 = 49/9 + 11/9 - 43/9 = 17/9 = 1 8/9