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Finding Unit Prices http://www.khanacademy.org/video/finding-unit-prices --------------------------------------- يتناول هذا الفيديو مسألة لإيجاد أسعار الوحدات -------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org