Question

expressão numérica [(21:7+2:1)+4]+6(14:2+3-5)

Answer 1

$[( \frac{21}{7} + \frac{2}{1} )+4]+6( \frac{14}{2} +3-5) =$

$=[(3+2)+4]+6(7+3-5)= \\ \\ =[5+4]+6(10-5)= \\ \\ =9+6.5=9+30=39$

Answer 2

[(21/7 +2/1)+4]+6(14/2+3-5)
[3+2+4]+6(7+3-5)
[5+4]+6(10-5)
9+6(5)
9+30 = 39    ok