Question

Calcule as potencias de expoente negativo e de reposta na forma decimal

A) (2/3) Expoente -2

B) (5/2) Expoente -3

Answer 1

Quando temos expoente negativos,temos que inverter a base para deixa-lo positivo.
a)(2/3)^-2=(3/2)^2=9/4=2,25
b)(5/2)^-3=(2/5)^3=8/125=0,064

Espero ter ajudado

Answer 2

$a) \\ \\ ( \frac{2}{3} )^{-2}= ( \frac{2^{-2}}{3^{-2}} )= \frac{3^{2}}{2^{2}} = \frac{9}{4} \\ \\ Obs.{:}\,\,3^2=3*3=9\,\,e\,\,2^2=2*2=4 \\ \\ b) \\ \\ ( \frac{5}{2} )^{-3}= ( \frac{5^{-3}}{2^{-3}} )= \frac{2^{3}}{5^{3}} = \frac{8}{125} \\ \\ Obs.{:}\,\, 2^3=2*2*2=8\,\,e\,\,5^3=5*5*5=125$