85 :17 = 5
17 * 5 = 86
__________
27 : 29 = 3
29 * 3 = 27
-0,5____________-0,75______-0,875
<span>2целых1/3+4целых1/10÷(2целых7/15-5/12)×5/6
1) </span>2целых7/15-5/12 = 369/180 = 2 целых 1/20
2) 2 целых 1/20×5/6 = 41/24 = 1 целая 17/24
3)4целых1/10÷1 целая 17/24 = 41/10*21/41 = 12/5 = 2 целых 2/5
4)2целых1/3+2 целых 2/5 = 71/15 = 4 целых 11/15