[(2 целых 1/3-1 целая 7/9):30/49]+11 целых 5/6

((2 1/3 - 1 7/9) : 30/49) + 11 5/6 = 12 целых 20/27

1) 2 1/3 - 1 7/9 = 2 3/9 - 1 7/9 = 1 12/9 - 1 7/9 = 5/9

2) 5/9 : 30/49 = 5/9 49/30 + (149)/(96) = 49/54

3) 49/54 + 11 5/6 = 49/54 + 11 45/54 = 11 94/54 = 11 47/27 = 12 20/27

Ответ:

Пошаговое изъясненье:

2 1/3-1 7/9=1 4/3-1 7/9=1 12/9-1 7/9=5/9

5/9:30/49=5/9*49/30=49/54

49/54+11 5/6=49/54+11 45/54=11 94/54=12 40/54=12 20/27