Exercice 2 :

a) (-4) + (+7)=
b) (+3)+ (- 9)=
c) (-6) + (- 10) =
d) (-9) - (+5)=
e) (+ 8) - (-15)=
f) (-2)-(-9) =
g) (-6,2) + (+ 3) + (-3,8) + (+6)=
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