(6 - 4 8/15) : 2,2 = 2/3
1) 6 - 4 8/15 = 5 15/15 - 4 8/15 = 1 целая 7/15 = 22/15
2) 22/15 : 2,2 = 22/15 : 22/10 = 22/15 * 10/22 = 10/15 = 2/3
Пояснения:
1 целая 7/15 = (1*15+7)/15 = 22/15
2,2 = 2 целых 2/10 = (2*10+2)/10 = 22/10
10/15 = 2/3 - сократили на 5