\( 1 \frac{1}{4} \cdot \frac{4}{5} = \frac{5}{4} \cdot \frac{4}{5} = 1 \)
\( \frac{6}{3} = 2 \)
\( \frac{16}{15} - \frac{2}{5} = \frac{16 - 2 \cdot 3}{15} = \frac{16 - 6}{15} = \frac{10}{15} = \frac{2}{3} \)
\( \frac{2}{3} - 2 = \frac{2 - 6}{3} = -\frac{4}{3} \)
\( -\frac{4}{3} + 1 = \frac{-4 + 3}{3} = -\frac{1}{3} \)
Ответ: -1/3