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amymal
@amymal
January 2021
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L'exercice 1 svp, merci
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AhYan
1) x= prix stylo (Ps)
Prix cahier (Pc)=> 0,30€ de plus que le stylo, donc on a :
Pc = Ps + 0,30 = x +0,30
Prix bâton de colle (Pb)=> le double du prix du cahier, donc on a:
Pb = 2×Pc = 2(x+0,30) = 2x + 0,60
5 cahiers, 3 stylos et 2 bâton de colle
Somme = 5(x-0,30) + 3x + 2(2x+0,60)
= 5x + 1,50 + 3x + 4x + 1,20
= 12x + 2,70 euros
2) Pour x = 1€
S = 12×1 + 2,70 = 12 + 2,70 = 14,70€
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Lista de comentários
Prix cahier (Pc)=> 0,30€ de plus que le stylo, donc on a :
Pc = Ps + 0,30 = x +0,30
Prix bâton de colle (Pb)=> le double du prix du cahier, donc on a:
Pb = 2×Pc = 2(x+0,30) = 2x + 0,60
5 cahiers, 3 stylos et 2 bâton de colle
Somme = 5(x-0,30) + 3x + 2(2x+0,60)
= 5x + 1,50 + 3x + 4x + 1,20
= 12x + 2,70 euros
2) Pour x = 1€
S = 12×1 + 2,70 = 12 + 2,70 = 14,70€