Question

Calcule as seguintes potências :
A) (-2)²
B) -(1/2) ²
C) (-3)²
D) (0,999...)³
E) 3²

Obs- Todos os expoentes são negativos

Answer 1

Boa tarde Silicone!

Solução! 

$A)~~(-2)^{2}= \left(-\dfrac{1}{2}\right)^{2}= \left(-\dfrac{1}{2}. -\dfrac{1}{2} \right)= \dfrac{1}{4} \\\\\\ B)~~ -\left(\dfrac{1}{2}\right)^{-2}= -(2)^{2} =-(2.2)=-4\\\\\\ C)~~(0,999)^{-3}=(1)^{-3}=(1.1.1)=1 \\\\\\ D)~~~(3)^{-2}=\left(\dfrac{1}{3}\right)^{2}= \left(\dfrac{1}{3}. \dfrac{1}{3} \right)= \dfrac{1}{9}$

Boa tarde!

Bons estudos!