calcule:
(obs:preciso que tenha as contas )

A) -8+6-1=
B) -2-4-1=
C) 12-7+3=
D) 4+13-21=
E) (+8)-(+5)=
F) (-8)+(-5)=
G) (-3)+(+9)=
H) (+2)+(-7)=
I) -13+7-2-8+15-1=
J) +22-3-14-5+24+12=
K) (-2)-(-3)+(+5)=
L) (+6)+(-7)-(-2)=​
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