2целых 4 петнацытых - (2- 1целая 1 петнацытых): 4 десятых+ 2 третих

2 4/15 - (2 - 1 1/15) : 4/9 + 2/3 = 5/6

1) 2 - 1 1/15 = 1 15/15 - 1 1/15 = 14/15
2) 14/15 : 4/9 = 14/15 * 9/4 = (7*3)/(5*2) = 21/10 = 2 1/10
3) 2 4/15 - 2 1/10 = 2 8/30 - 2 3/30 = 5/30 = 1/6
4) 1/6 + 2/3 = 1/6 + 4/6 = 5/6