$$ 2 \frac{5}{8} = \frac{2*8+5}{8} = \frac{16+5}{8} = \frac{21}{8} $$
$$ 10 \frac{6}{7} = \frac{10*7+6}{7} = \frac{70+6}{7} = \frac{76}{7} $$
Ответ: 1) $$ \frac{21}{8} $$, 10) $$ \frac{76}{7} $$