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Dracolosse
@Dracolosse
May 2019
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Bonjour
Un commerçant dispose dans sa caisse de 40 billets.Il y a des billets de 10 euros et des billets de 20 euros pour une valeur totale de 550 euros.
Calculer le nombre de billets de 20 euros.Sous forme d'équation
merci
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Commentaires (10)
Verified answer
Bonjour,
x =les billets de 10e
(40-x) = les billets de 20e
10x+20(40-x) = 550
10x+800-20x = 550
-10x =550-800
x = 25
25 billets de 10e
15 billets de 20e
1 votes
Thanks 1
Dracolosse
car -10x/-10x=1 et donc 250/-10=-25
Dracolosse
donc ............ ca veut dire quoi ca
Dracolosse
a ok merci
Dracolosse
et pourquoi pas 800-250
Dracolosse
nn attend pourquoi pas 800-550
Dracolosse
et vous vous avez mis 550-800
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Verified answer
Bonjour,x =les billets de 10e
(40-x) = les billets de 20e
10x+20(40-x) = 550
10x+800-20x = 550
-10x =550-800
x = 25
25 billets de 10e
15 billets de 20e