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Ladder rate-of-change problem http://www.khanacademy.org/video/ladder-rate-of-change-problem ------------------------------------------------------ يتناول هذا الفيديو حل مسألة حول نسبة التغير السلمية ------------------------------------------------------ شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org