2) в)
\[ 6^{4}:6^{-1} = 6^{4 - (-1)} = 6^{4+1} = 6^5 \]
2) г)
\[ \frac{1}{7}^{-3} : \frac{1}{7}^{-7} = \left(\frac{1}{7}\right)^{-3 - (-7)} = \left(\frac{1}{7}\right)^{-3+7} = \left(\frac{1}{7}\right)^{4} = \frac{1^4}{7^4} = \frac{1}{2401} \]