Ответ:

\((\sqrt{5})^{12}=5^6=15625\).

\(\sqrt{70}\cdot\sqrt{30}=\sqrt{2100}=10\sqrt{21}\).

\(\sqrt{76}=2\sqrt{19}\).

Следовательно,

\[\frac{(\sqrt{5})^{12}-\sqrt{70}\cdot\sqrt{30}}{\sqrt{76}}=\frac{15625-10\sqrt{21}}{2\sqrt{19}}.\]

Ответ: \(\dfrac{15625-10\sqrt{21}}{2\sqrt{19}}\).