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LENA455
@LENA455
May 2019
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Deux croissants et cinq chocolatines coûtent 4,50 €. Quatre croissants et neuf chocolatines coûtent 8,28 €.
A. Combien coûtent quatre croissants et dix chocolatines ?
B. En déduire le prix d'une chocolatines puis celui d'un croissant. Svppp
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sarahr9927
Bonjour
tu appelles x les croissants et y les chocolatines
2 x + 5 y = 4.50
4x + 9 y = 8.28
-4x - 10y = - 9
4x + 9y = 8.28
- y = - 0,72
une chocolatine coûte 0,72€
2x + 3.6 = 4.5
2x = 4.5 - 3.6
2x = 0.90
x = 0.45
un croissant vaut 0,45€
on vérifie
0.90 + 3.6 = 4.50
3 votes
Thanks 3
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Lista de comentários
tu appelles x les croissants et y les chocolatines
2 x + 5 y = 4.50
4x + 9 y = 8.28
-4x - 10y = - 9
4x + 9y = 8.28
- y = - 0,72
une chocolatine coûte 0,72€
2x + 3.6 = 4.5
2x = 4.5 - 3.6
2x = 0.90
x = 0.45
un croissant vaut 0,45€
on vérifie
0.90 + 3.6 = 4.50