Question

assinale a sentença correta:

$a) \: \frac{2 + \sqrt{3} }{2} = 1 + \sqrt{3}$
$b) \: - {2}^{2} = - 4$
$c) \: \frac{1}{2} + \frac{1}{3} = \frac{2}{5}$
$d) \: {3}^{2} + {3}^{5} = {3}^{7}$

Answer 1

Correta: b

B) - 2^2 = - 2.2 = - 4

As outras:

A)

= (2 + √3)/2

= 2/2 + √3/2

= 1 + (√3/2)

C)

= 1/2 + 1/3

= (3 + 2)/6

= 5/6

D)

= 3^2 + 3^5

= 9 + 243

= 252

Resp.: b