((2 + 5/18) - 1,25) / (4 + 1/9) = 37/36 : 37/9 = 1/4
(7/15 - 5/12) * 5 = 3/60 * 5 = 1/4
((3 + 5/9) - 2,2 - 2/15) * (-3/11) = (14/9 - 1/5 - 2/15) * (-3/11) = -11/9 * 3/11 = -1/3
((1 + 7/9 - 2) * 2,25 = -2/9 * 9/4 = -1/2
1/4 : 1/4 = 1
-1/3 : (-1/2) = 2/3
1 + 2/3 = 5/3
Ответ: 5/3.