Решить по действиям (3,6-1 2/3):(4 1/15-2 7/9)*2,6

(3,6 - 1 2/3) : (4 1/15 - 2 7/9) * 2,6 = 3 216/305. 

1) 3 6/10 - 1 2/3 = 36/10 - 5/3 = (36 * 3)/(10 * 3) - (5 * 10)/(3 * 10) = 108/30 - 50/30 = (108 - 50)/30 = 58/30; 

2) 4 1/15 - 2 7/9 = 61/15 - 25/9 = (62 * 3)/(15 * 3) - (25 * 5)/(9 * 5) = 186/45 - 125/45 = (186 - 125)/45 = 61/45; 

3) 58/30 : 61/45 = 58/30 * 45/61 = (58 * 45)/(30 * 61) = 2610/1830 = 87/61 = 1 26/61; 

4) 1 26/61 * 2,6 = 87/61 * 26/10 = ( 87 * 26)/(61 * 10) = 2262/610 = 3 432/610 = 3 216/305.