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المحتوى الرئيسي
Simplifying Rates and Ratios http://www.khanacademy.org/video/simplifying-rates-and-ratios ----------------------------- يتناول هذا الفيديو مسألة لتبسيط النسب والمعدلات ---------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org