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Simple Quadratic Equation http://www.khanacademy.org/video/simple-quadratic-equation ------------------------------------------ يتناول هذا الفيديو حل لمعادلة تربيعية بسيطة ---------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org