Simplifiez $\dfrac{9^{-6}\times 9^{-9}}{9^{-4}}$=

Simplifiez $\bigg(\dfrac{11^{4}}{11^{11}}\bigg)^{-5}$=

Simplifiez $\bigg(5^{-11}\bigg)^{-10}$=

Simplifiez $7^{3}\times (-3)^{3}$=

Simplifiez $\bigg(\dfrac{11^{11}}{11^{-2}}\bigg)^{-12}$=

Simplifiez $5^{-7}\times 5^{4}\times 5^{9}$=

Simplifiez $\dfrac{5^{-5}\times 5^{-12}}{5^{-9}}$=

Simplifiez $\dfrac{4^{-5}\times 4^{-11}}{4^{-5}}$=

Simplifiez $\dfrac{3^{-3}}{3^{5}}$=

Simplifiez $6^{-3}\times 4^{-3}$=