1) 3 1/8 -7 5/6 = 25/8 - 47/6 = (25*3 - 47*4)/24 = -113/24
2) -113/24 : (-4 17/24) = -113/24 : (-113/24) = -113/24 * (-24/113) = 1
3) 1 * (-1,8) = -1,8
4) 5 1/9 * 6/23 = 46/9 * 6/23 = (2*2)/(3*1) = 4/3
5) 4/3 - 4 = (4-12)/3 = -8/3
6) 0,3 * (-8/3) = 3/10 * (-8/3) = -4/5
7) -4/5 : (-1 1/3) = -4/5 : (-4/3) = -4/5 * (-3/4) = 3/5
8) -1,8 : 3/5 = -18/10 * 5/3 = -6/2 = -3
Ответ: -3