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Efectuează:
a) -9-(-6)+8=
b)-1-(+3)-6=
c)+12-(-9)-2=
d)+6-(-4)+10=
e)-21-(+17)-(-2)=
f)0-(-8)-(+8)
g)+11-(-9)-(+5)=
h)4-(+3)+(-7)=
i)0-(+9)+(-9)=
j)-6-[(-4)-(-5)]=
k)-4-[(-4)-(-5)]=
l)-[9-(-9)]-5=
Dau coroana