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Exercice 1: Calculer mentalement.
(-4)×(-5) =.......
(-7)×4 =......
(-3)×7 =.......
(-2)×(+5) =......
8×(-2) =.......
-2 × 3,5 =........

Aider moi svp, je vous serais très reconnaissante mrc.​

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