Question

Dados:
A=4-6;
B=1+7-3+2;
C=-3+5-1.

Calcule:
a) A+B;
b) A+C;
c) B+C;
d) A+B+C

Answer 1

a)A+B=(4-6)+(1+7-3+2)=
4-6+1+7-3+2=
-2+1+7-3+2=
-2+8-3+2=
6-1=
5
b)A+C=(4-6)+(3+5-1)=
4-6+3+5-1=
-2+3+5-1=
-2+3+4=
-2+7=
5
c)B+C=(1+7-3+2)+(-3+5-1)=
1+7-3+2-3+5-1=
8-3+5-1=
5+5-1=
10-1=
9
d)A+B+C=(4-6)+(1+7-3+2)+(-3+5-1)=
4-6+1+7-3+2-3+5-1=
-2+1+7-3+2-3+5-1=
-2+8-3+2-3+5-1=
-2+5+2-3+5-1=
-2+7-3+5-1=
-2+4+5-1=
2+5-1=
7-1=
6