Exercice 1 :
Calcule les expressions suivantes en détaillant les étapes (voir exemples du chapitre 1)
A = 2 × (-3) – 5 × 7
B = 6 × (4 – 3 × 8)
C = -5 × (-7) + 45 : (-5)
D = (6 + 4 × (-5)) : (20 – 3 × 8 – 3) E = 15 + 3 × (-8) × (-2) – 4
F = 7 × (-4) – (6 + 8) : (-2) – 4 × 3 G = -15 – 12 + 8 – 6 + 11 – 3 + 7 + 12
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