54. \(\frac{8}{15} - 1\frac{17}{30}\)

Решение:

\(\frac{8}{15} - 1\frac{17}{30} = \frac{8}{15} - \frac{47}{30} = \frac{8 \times 2}{15 \times 2} - \frac{47}{30} = \frac{16}{30} - \frac{47}{30} = \frac{16 - 47}{30} = -\frac{31}{30}\)

Ответ: -\(\frac{31}{30}\)