Réponses

  • Utilisateur Brainly
2013-09-08T09:33:21+02:00
A=3-5*(-4)-1+7*(-3)+5-7
  =3+5x4-1-7x3+5-7
  =3+20-1-21-2
  =23-24
  =-1

B=-6-(-2)*5+(-7)*(-1)-3*5

  =-6+2x5+7x1-3x5
  =-6+10+7-15
  =17-21
  =-4