25. Вычислите: 8/5 : 16/25 − 7 1/4 + 2 5/8 · 10/7.

\[\frac85:\frac{16}{25}=\frac85\cdot\frac{25}{16}=\frac52,\quad 2\frac58\cdot\frac{10}{7}=\frac{21}{8}\cdot\frac{10}{7}=\frac{15}{4}.\]

\[\frac52-7\frac14+\frac{15}{4}=\frac{10-29+15}{4}=-1.\]

Ответ: \(-1\).