А) (4 16/16 - 3 7/16) + (3 16/16 - 2 9/16)=1 9/16 + 1 7/16 =3
б) (4 19/19 - 2 7/19) - (3 19/19 - 3 2/19) = 2 12/19 - 17/19 = 1 31/19 - 17/19 = 1 14/19
в) (1 9/9 - 1 5/9) + (3 9/9 - 1 4/9) = 4/9 + 2 5/9 = 3
г) (7 20/20 - 4 13/20) - (5 20/20 - 5 3/20) = 3 7/20 - 17/20 = 2 27/20 - 17/20 = 2 10/20 = 2 1/2 = 2,5