Réponse:
bonjour
bonjourcafé = x
bonjourcafé = xdiabolo = 2 x
bonjourcafé = xdiabolo = 2 x2 x + 3 ( 2 x ) = 12
bonjourcafé = xdiabolo = 2 x2 x + 3 ( 2 x ) = 122 x + 6 x = 12
bonjourcafé = xdiabolo = 2 x2 x + 3 ( 2 x ) = 122 x + 6 x = 128 x = 12
bonjourcafé = xdiabolo = 2 x2 x + 3 ( 2 x ) = 122 x + 6 x = 128 x = 12x = 12/8 = 1.5
bonjourcafé = xdiabolo = 2 x2 x + 3 ( 2 x ) = 122 x + 6 x = 128 x = 12x = 12/8 = 1.5café = 1.50 € et diabolo = 3 €