Question

calcule a potencia de ($\sqrt{18 ^{-2}$)

Answer 1

$\sqrt{ 18^{-2} }$

$\sqrt{ 1/18^{2} }$   -> Corta-se o expoente e a raiz

1/18

Answer 2

$\sqrt{18}^{-2}\Rightarrow(18^{\frac{1}{2}})^{-2}\Rightarrow18^{-\frac{2}{2}}\Rightarrow18^{-1}=\boxed{\dfrac{1}{18}}$