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Un particulier dispose d'un capital qu'il divise en 2 parts inégales selon un rapport un tiers deux tiers. Il investit chacune des 2 sommes à des taux annuels d'intérêt différents.À quel taux d'intérêt annuel la partie la plus importante a-t-elle été placée ?(1) La plus petite partie est placée à un taux annuel de 5 % et a rapporté 550 euros la 1re année.(2) Au bout d'un an, l'ensemble du capital a rapporté 1 430 euros.

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