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Understanding Proportions http://www.khanacademy.org/video/understanding-proportions -------------------------------- يتناول هذا الفيديو مثالاً يوضح مفهوم التناسب --------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org