Question

Elimine os parenteses e calcule :
A:
(-34)+(+12)=
B:
(-84)+(+84)=
C:
(+48)+(-66)=
D:
(-91)+0:
E:
0+(+77)=

Answer 1

a)-34+12 =-22
b)-84+84=0
c)+48-66=-18
d)-91+0=-91
e)0+77=+77

Answer 2

A = - 22
B = 0
C = - 18 
D = - 91
C = 77