ΓΛΩΣΣΑ ΕΝΟΤΗΤΑ 13: ΚΑΤΑΣΚΕΥΕΣ ΤΗΣ ΦΥΣΗΣ

https://users.sch.gr/dimylonaki/mathimata_glossa_kataskeves_tis_fisis.htm 

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https://anoixtosxoleio.weebly.com/kappaalphataualphasigmakappaepsilonupsilon941sigmaf.html 

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https://lesson.e-wall.net/%CE%BC%CE%B1%CE%B8%CE%AE%CE%BC%CE%B1%CF%84%CE%B1/%CE%B5-%CF%84%CE%AC%CE%BE%CE%B7/%CE%B3%CE%BB%CF%8E%CF%83%CF%83%CE%B1/%CE%B5%CE%BD%CF%8C%CF%84%CE%B7%CF%84%CE%B1-13-%CE%BA%CE%B1%CF%84%CE%B1%CF%83%CE%BA%CE%B5%CF%85%CE%AD%CF%82/ 

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https://e-taksh.blogspot.com/2015/03/131.html