Bonsoir Savez vous m expliquer les etapes de ces calculs merci énormément

Exercice 2
1°) Calculer les expressions suivantes en écrivant les étapes intermédiaires:
M = (-3 +9) - (4 - 11) - (-5-6)
N=-3-[4-(3-9)]
P = [(+2) - (+ 5)] + [(-7) + (+4)]
R = (-15) - (-8-3) + (6 - (-8))​
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