bonjours je suis en 4eme et j'aurais besoin d'aide

CALCUL MENTAL) On donne: a=-90;b=-10;C=5

1. Calculer A= a÷(-b)
2.Calculer B= -c÷(-b)
3.Calculer C= moins -a sur b
4.Calculer D= b sur -c​

REGARDER LA PIECE JOITE CEST MIEUX EXPLIQUER
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