\[\boxed{\text{30\ (30).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ 6a\ :18a^{5} = \frac{6a}{18a^{5}} = \frac{1}{3a^{4}}\]
\[2)\ 16b^{7}\ :48b^{4} = \frac{16b^{7}}{48b^{4}} = \frac{b^{3}}{3}\]
\[3)\ 35a^{8}b^{6}\ :\left( - 49a^{6}b^{8} \right) =\]
\[= \frac{35a^{8}b^{6}}{- 49a^{6}b^{8}} = - \frac{5a^{2}}{7b^{2}}\]