А) - 8 3/4 - 2 7/9 = - 8 27/36 - 2 28/36 = - 10 55/36 = - 11 19/36
б) - 5 1/10 + 3 7/8 = - 5 4/40 + 3 35/40 = - 1 9/40
в) 3 5/6 - 4 1/9 = 3 15/18 - 4 2/18 = - 5/18
г) - 6 1/20 - 3 9/10 = - 6 1/20 - 3 18/20 = - 9 19/20
д) - 4 5/6 + 7 1/8 = - 4 20/24 + 7 3/24 = 2 7/24