$$ \frac{19}{6} = 3 \frac{1}{6} $$
$$ \frac{11}{2} = 5 \frac{1}{2} $$
$$ \frac{21}{17} = 1 \frac{4}{17} $$
$$ \frac{52}{10} = 5 \frac{2}{10} = 5 \frac{1}{5} $$
Ответ: 1) $$ 3 \frac{1}{6} $$, 2) $$ 5 \frac{1}{2} $$, 10) $$ 1 \frac{4}{17} $$, 11) $$ 5 \frac{1}{5} $$