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Conference-reflexion - Académie de Montpellier

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2. Les billards rectangulaires◮ Une question difficile posée dans l’exercice d’Olympia<strong>de</strong> : enpartant <strong>de</strong> n’importe quel point d’une ban<strong>de</strong>, peut-on revenir aupoint <strong>de</strong> départ en trois ban<strong>de</strong>s ?

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