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

Simplifiez $3^{8}\times (-4)^{8}$=

Simplifiez $11^{-4}\times\dfrac{11^{-7}}{11^{11}}$=

Simplifiez $\dfrac{5^{-7}\times 5^{-2}}{5^{-8}}$=

Simplifiez $4^{-8}\times 2^{-8}$=

Simplifiez $3^{10}\times (-2)^{10}$=

Simplifiez $2^{-11}\times 2^{10}\times 2^{11}$=

Simplifiez $3^{2}\times (-4)^{2}$=

Simplifiez $7^{12}\times\dfrac{7^{-9}}{7^{8}}$=

Simplifiez $\bigg(\dfrac{8^{9}}{8^{4}}\bigg)^{7}$=