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Introduction to the quadratic equation http://www.khanacademy.org/video/introduction-to-the-quadratic-equation -------------------------------------- يوضح هذا الفيديو طريقة استخدام المعادلة التربيعية ------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org