January 2020 2 149 Report
6) Calcule:

a) (-2) + (13) + (8) + (-5)=
b) (5) + (1) + (-4) + (-8) + (2)=
c) (10) - (-5) - (-3) - (-9)=
d) -(10) - (-5) + (-6) + (-9) - (-6)=
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