9*(7/8+3/4)-1:5/6*25/48
1) 7/8 + 3/4 = 13/8
2) 9 × 13/8 = 117/8
3) 1 : 5/6 = 6/5
4) 6/5 × 25/48 = 5/8
5) 117/8 - 5/8 = 112/8
112/8 = 14
Ответ: 14