(Aidez moi svp c'est pour demain ) calculez les expressions numérique suivante en détaillant les étapes de calcul


A= (-14) + (+3) + (-2) + (-7) + (+11)

B= (+6) + (-7) + (+13) + (-4) + (-17) + (-21)

C= (-120) + (-80) + (-120) + (+50) + (+20)

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