д) (13 - 8 5/12) + (17 1/2 - 16 1/5)

(12 12/12 - 8 5/12) + (17 5/10 - 16 2/10) = 4 7/12 + 1 3/10 = 4 35/60 + 1 18/60 = 5 53/60