Question

1 - Calcule o valor de (-0,9)-²​

Answer 1

Espero ter ajudado.

$\left(-0.9\right)^{-2}\\\\\frac{1}{\left(-0.9\right)^2}\\\\\frac{1}{0.81} : 0.81$

Answer 2

(-0,9)-² = (-9/10)-² = (-10/9)² = 100/81