Question

quanto é 1/-2 + 1/(1/3)

Answer 1

1/-2 + 1/(1/3) 

1/-2 + 1/1 . 3/1 

1/-2 + 3/1 

1/-2 + 3 

1/-2 + -6/-2  
 
-5/-2 = 5/2                          ok

Answer 2

$-\frac{1}{2} + \frac{1}{ (\frac{1}{3}) }$
$-\frac{1}{2} + 1 \frac{3}{1}$
$-\frac{1}{2} + \frac{3}{1} = -\frac{1}{2} + \frac{6}{2} = \frac{5}{2}$