Question

calcule
$( {2}^{ - 1} + {2}^{ - 2}) { - 2}.$

Answer 1

Vamos lá:
(2^-1 + 2^-2) - 2 =
(1/2^1 + 1/2^2) - 2 =
(1/2 + 1/4) - 2 =
2/4 + 1/4 - 2 =
2/4 + 1/4 - 8/4 = - 5/4

Bons estudos !