(3 целых - 15/28 * 1 целая 1/6) * 2 целых 2/19 =

(3 - 15/28 * 1 1/6) * 2 2/19 = 5
1) 15/28 * 1 1/6 = 15/28 * 7/6 = (5*1)/(4*2) = 5/8
2) 3 - 5/8 = 2 8/8 - 5/8 = 2 3/8
3) 2 3/8 * 2 2/19 = 19/8 * 40/19 = 40/8 = 5