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1. \(\dfrac{3^{-9}}{3^{-2} \cdot 3^{-6}} = \) [ ].
2. \(\dfrac{2^{-4} \cdot 2^{-6}}{2^{-8}} = \) [ ].
3. \(\left( \dfrac{5^{5}}{5^{3}\cdot 5^{4}} \right)^{-1} = \) [ ].
4. \(\left( \dfrac{7^{-9} \cdot 7^{-4}}{7^{-7} \cdot 7^{-5}} \right)^{-2} = \) [ ].