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Quadratic Formula (proof) http://www.khanacademy.org/video/quadratic-formula--proof -------------------------------------- يتناول هذا الفيديو إثبات للصيغة التربيعية -------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org