Bonjour <3 Exercice : sans poser et sans effectuer et sans utiliser la calculatrice calculer
aide: (a+b)(c+d)=(a+b)x(c+d)=aXc+aXd+bXc+bXd
exemple : 12x1,3=(10+2)(1+0,3)=(10+2)x(1+0,3)=10x0,3+2x1+2x0,3

104x13=
89x5+89x0,6+11x5+11x0,6=
103²-101²=
997x1003=

merci de votre aide
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