Aidez moi svp exercice /
effectuer les calculs suivants en detaillant les etapes. simplifier ensuite les resultats obtenus .
a= -5 multiplier par 3 sur -8 +2
b= -9 + 6-5 sur 4-(6-8)
c= (6-3) multiplier (-9+5) sur (7-9+1) multiplier (2 multiplier 8)
  


merci
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