Question

me ajudem pfvvvvv, é urgente​

Answer 1

Resposta:

A)

$(1-\dfrac{2}{5})^{-2}=\\\\ \\ (\dfrac{5-2}{5})^{-2}=\\ \\ \\ (\dfrac{3}{5})^{-2}=(\dfrac{5}{3})^2=\dfrac{25}{9}$

B)

$(\dfrac{5}{4}-1)^{-3}=\\ \\ \\ (\dfrac{5-4}{4})^{-3}=\\ \\ \\ (\dfrac{1}{4})^{-3}=(\dfrac{4}{1})^3=\boxed{64}$