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Xav54
@Xav54
June 2021
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Exercice 24 ! Merci à ceux qui m'aideront ! 12 point a gagné ! :)
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nonotata
Soit x les livres a 40f
et y les livres a 45f
on sait que
x+y =35
40x +45 y = 1475
x = 35 -y
40(35-y) +45y = 1475
1400 -40y +45y =1475
5y = 1475-1400
y =75/5
y = 15
donc 15 livres a 45 f
x = 35 -y = 35 -15 =20
et 20 livres a 40f
1 votes
Thanks 1
Thomas1106
Vente de livres à 45 F : x livres ⇒ 45x F
Vente de livres à 40 F : 35-x livres ⇒ 40*(35-x) F
45x+40*(35-x) = 1475
45x+1400-40x = 1475
5x+1400 = 1475
5x+1400-1400 = 1475-1400
5x = 75
x = 75/5
x = 15
Vente de livres à 45 F :
x =
15 livres
Vente de livre à 40 F :
35-x = 35-15 =
20 livres
1 votes
Thanks 1
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Lista de comentários
et y les livres a 45f
on sait que
x+y =35
40x +45 y = 1475
x = 35 -y
40(35-y) +45y = 1475
1400 -40y +45y =1475
5y = 1475-1400
y =75/5
y = 15
donc 15 livres a 45 f
x = 35 -y = 35 -15 =20
et 20 livres a 40f
Vente de livres à 40 F : 35-x livres ⇒ 40*(35-x) F
45x+40*(35-x) = 1475
45x+1400-40x = 1475
5x+1400 = 1475
5x+1400-1400 = 1475-1400
5x = 75
x = 75/5
x = 15
Vente de livres à 45 F : x = 15 livres
Vente de livre à 40 F : 35-x = 35-15 = 20 livres