1) 1 1/14 - 4 5/7 = 15/14 - 33/7=15/14 - 66/14 = - 51/14
2) -51/14 * 4 2/3 = -51/14 * 14/3 = -17
3) - 1 5/6 + 3 2/9 = - 11/6 + 29/9 = -33/18 + 58/18 = 25/18
4) 25/18 * 9/25 = 1/2
5) -17 -1/2 = -17 1/2
6) 11 1/3 : (-17 1/2) = 34/3 : (-35/2) = 34/3 * (-2/35)=- 68/105