K) 7/8 * 9 + 5/9 : 1/2 * 9

Решение:

1. \( \frac{7}{8} \times 9 = \frac{63}{8} \)
2. \( \frac{5}{9} : \frac{1}{2} = \frac{5}{9} \times 2 = \frac{10}{9} \)
3. \( \frac{10}{9} \times 9 = 10 \)
4. \( \frac{63}{8} + 10 = 7\frac{7}{8} + 10 = 17\frac{7}{8} \)

Ответ: \( 17\frac{7}{8} \)