Question

Cat face 2 supra 5 la puterea minus 2?

Answer 1

$\it\left(\dfrac{2}{5}\right)^{-2}=\left[\left(\dfrac{2}{5}\right)^{-1}\right]^2=\left(\dfrac{5}{2}\right)^{2}=\dfrac{5^2}{2^2}=\dfrac{25}{4}$