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https://matimatok.wordpress.com/2016/05/03/%d7%a4%d7%aa%d7%a8%d7%95%d7%9f-%d7%aa%d7%a8%d7%92%d7%99%d7%9c%d7%99%d7%9d-4-5-%d7%9e%d7%91%d7%97%d7%9f-%d7%9e%d7%a4%d7%9e%d7%a8-%d7%9b%d7%99%d7%aa%d7%94-%d7%96-2010/
פתרון תרגילים 4-5 מבחן מפמ"ר כיתה ז' 2010