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Rates-of-change (part 2) http://www.khanacademy.org/video/rates-of-change--part-2 -------------------------------------------- يتناول هذا الفيديو معدلات التغير للاقترانات -------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org