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Est-tu bon en calcul mental? Oui? Vérifions!...

Est-tu bon en calcul mental? Oui? Vérifions!. Je vais te proposer quelques opérations très faciles. . . pour ne pas trop te déstabiliser. Tu es prêt, alors c’est parti. Un bus part pour sa tournée habituelle à vide. Pour son premier arrêt : 15 passagers montent. Le bus repart.

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Est-tu bon en calcul mental? Oui? Vérifions!...

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