Question

Efetue as adições:
A) (+1/2) + (3/7) =
B) (-1/3) + (2/5)=
C) (-5/6) + (+1/2)=
D) (-2/3) + (+4/9)=

OBS: Esses (/) barras significam _
Por FAVOR GENTE me AJUDEM!!!

Answer 1

a) $\frac{13}{14}$
b) $\frac{1}{15}$
c) $-/frac{1}{3}$
d) $-/frac{2}{9}$