д) (13 - 8 5/12) + (17 1/2 - 16 1/5)

(13 - 8 5/12) + (17 1/2 - 16 1/5) = (13 - 101/12) + (35/2 - 81/5) = 55/12 + 175/30 - 486/30 = 55/12 - 311/30 = 1375/360 - 3110/360 = -1735/360 = -4 295/360 = -4 59/72