Exercice 2: Calculer les différences suivantes : A = (+5) - (+3) D = (-4)-(-3) G=(-9,9)-(-8,5) B = (+6)-(-2) E = (+21,7) -(-6,9) H = (+3) - (-3) C=(-2)-(+8) F = (+63,5) - (+4,8) I=(-7)-(+7) Exercice 3: Simplifier l'écriture des expressions suivantes puis les calculer. A=-(-3) + (+5) + (-14) + (-7) B = (+12) + (-8) + (+13) + (-9) D=(-4,5) + (-5,5) + (+6,3) - (+7,3) E = (+17,5) - (-2,8) + (-4,5) - (6,7) F=- (+1,1) - (+2,2) + (+3,3) - (-4,4)​

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