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Alternate Solution to Ratio Problem (HD Version) http://www.khanacademy.org/video/alternate-solution-to-ratio-problem--hd-version ------------------------------------ يتناول هذا الفيديو طرق بديلة لحل مسائل النسب -------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org