Ответ:

5

Пошаговое объяснение:

1) 2 3/4 : 1,1 = 11/4 : 11/10 = 11/4 * 10/11 = 5/2

2) 5/2 + 3 1/3 = 5/2 + 10/3 = 15/6 + 20/6 = 35/6

3) 0,4 * 3 1/3 = 4/10 * 10/3 = 4/3

4) 2,5 - 4/3 = 25/10 - 4/3 = 75/30 - 40/30 = 35/30 = 7/6

5) 35/6 : 7/6 = 35/6 * 6/7 = 5

6) 5 : 5/7 = 5 * 7/5 = 7

7) 2 1/6 + 4,5 = 2 1/6 + 4 1/2 = 2 1/6 + 4 3/6 = 6 4/6 = 6 2/3

8) 6 2/3 * 0,375 = 6 2/3 * 375/1000 = 20/3 * 3/8 = 5/2

9) 2,75 - 1 1/2 = 2,75 - 1,5 = 1,25

10) 5/2 : 1,25 = 2,5 : 1,25 = 2

11) 7 - 2 = 5

Ответ: 5