Exercice 2: Calcule en détaillant A= -3+(-5)-(-7)+(+8)-(+5)

B = 5-(-5)+4-(-4)+(-18)

C = 12-(+5)+(+4)-(-7)+2

C’est super simple mais assez long pour moi, donc si quelqu’un pourrais me donner les réponses Merci d’avance
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