Question

o numero real y expresso por y =(2 ^-3+2^-3) / (4^-1 + 4^-1) é:

a)1

b)- 0,5

c)- 1

d)0,5

e)2

Answer 1

Boa tarde!!

$y = \frac{(2^{-3} +2^{-3})}{(4^{-1} +4^{-1})}$

$y = \frac{( (\frac{1}{2})^{3} + (\frac{1}{2})^{3})}{( \frac{1}{4} + \frac{1}{4} )}$

$y = \frac{(\frac{1}{8} + \frac{1}{8})}{ \frac{2}{4}}$

$y = \frac{\frac{2}{8}}{ \frac{2}{4}} = \frac{\frac{1}{4}}{ \frac{1}{2}}$

$y = \frac{1}{4}. \frac{2}{1}} = \frac{2}{4} \\ y = 0,5$

Resposta letra D.

Bons estudos!