Verified answer

(43 целых 7/18 - 5 целых 2/9) - 12 целых 8/27 = 25 целых 47/54

1) 43 7/18 - 5 2/9 = 43 7/18 - 5 4/18 = 38 3/18 = 38 целых 1/6

2) 38 1/6 - 12 8/27 = 38 9/54 - 12 16/54 = 37 63/54 - 12 16/54 = 25 47/54

Ответ: 25 целых 47/54.

Пояснения:

2/9 = 4/18 - доп.множ. 2

3/18 = 1/6 - сократили на 3

1/6 = 9/54 - доп.множ. 9

8/27 = 16/54 - доп.множ. 2