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Slope of a line http://www.khanacademy.org/video/slope-of-a-line --------------------------------------------------------- يتناول هذا الفيديو مفهوم ميل الخط ويمثله بيانياً ----------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org