Simplifiez $\dfrac{5^{7}\times 5^{12}}{5^{8}}$=

Simplifiez $\dfrac{4^{-8}\times 4^{-9}}{4^{2}}$=

Simplifiez $\dfrac{10^{7}}{10^{12}}$=

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

Simplifiez $\bigg(\dfrac{6^{1}}{6^{-3}}\bigg)^{3}$=

Simplifiez $7^{6}\times 3^{6}$=

Simplifiez $\bigg(8^{5}\bigg)^{3}$=

Simplifiez $7^{12}\times 7^{-5}$=

Simplifiez $\dfrac{9^{9}}{9^{-1}}$=

Simplifiez $6^{-3}\times 6^{-1}$=