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1. \(\dfrac{3 \cdot 27^{-2}}{9^{-4}} = \) [ ].
2. \(\dfrac{25 \cdot 5^{-7}}{125^{-2}} = \) [ ].
3. \(\dfrac{8^{11} \cdot 32^{-2}}{4^7} = \) [ ].
4. \(\left( \dfrac{6^3}{3^3 \cdot 2^4}\right)^{-1} = \) [ ].