Bonjour, j'ai besoin d'aide pour cet exercice en mathématique ( j'ai trouvé ce même exercice mais la personne n'a pas répondu à la question posé). Bonsoir, j'ai besoin d'aide pour cet exercice en math et je suis en seconde.
Merci d'avance.

Un chocolatier souhaite proposer un nouveau chocolat avec 40 % de cacao. Pour cela, il prévoit de fondre et mélanger du chocolat noir avec 70 % de cacao et du chocolat au lait avec 20 % de cacao.
On note x (resp. y) la masse, en kg, de chocolat noir (resp.au lait) nécessaire pour obtenir 1 kg du nouveau chocolat.
a) Justifier que le couple (x ; y) doit être une solution du système :

(S) {0,7x + 0,2y = 0,4(x + y)
{x + y = 1
b) Ecrire chaque équation de ce système sous la forme ax + by + c = 0.
c) Résoudre ce système.
d) Conclure en indiquant au chocolatier le mélange à effectuer.
1 Voir la réponse
  • Bonjour, il me semble que la question a déjà était posé et une personne a répondu. Va voir sur le site.
  • Ce n'est pas exactement le même exercice
  • La question b) n'est pas la même ce qui fait que la c) non plus
  • Et bien excuse-moi, je croyais que c’était le même. Bon courage et bonne soirée
  • Merci et bonne soirée
olivierronat olivierronat

Réponse :

Explications étape par étape

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