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bonjour a tous, voici exercice, merci de m'aider, merci d'avance
A= -9+3-1+2 =
B= 4-1+9-3 =
C= 6-(-4)-3+1 =
D= 75 - (-7) + (+12) +(-7) =


Répondre :

bonjour

A= -9+3-1+2 = -9-1+3+2 = -10+5 = -5


 B= 4-1+9-3 = 4+9 -1-3 = 13-4 = 9


 C= 6-(-4)-3+1 = 6+4-3+1 =6+4+1-3 = 11-3 = 8


 D= 75 - (-7) + (+12) +(-7) = 75 +7+12-7 =75+12+7-7 = 75+12 = 87