Question

Quem pode resolver essa conta?

Answer 1

$Resolu\c{c}\~ao \to \boxed{\boxed{ \left\{\begin{array}{ccc}3^{-1}-3^{-2} = \frac{1^1}{3^1}-\frac{1^2}{3^2} = \frac{1}{3}-\frac{1}{9} = \frac{3-1}{9} = \frac{2}{9}\end{array}\right\} }}$

Espero ter ajudado. =^.^=