27/34 * (5 - 2 4/5 * 1 1/9) = 1,5
1) 2 4/5 * 1 1/9 = 14/5 * 10/9 = 14/1 * 2/9 = 28/9 = 3 1/9
2) 5 - 3 1/9 = 4 9/9 - 3 1/9 = 1 8/9
3) 27/34 * 1 8/9 = 27/34 * 17/9 = 3/2 = 1,5
