ΠΡΟΣΘΕΣΗ ΚΑΙ ΑΦΑΙΡΕΣΗ ΚΛΑΣΜΑΤΩΝ

http://www.daskalosa.eu/maths_e_ergasies/%CE%9C%CE%B1%CE%B8%CE%B7%CE%BC%CE%B1%CF%84%CE%B9%CE%BA%CE%AC_%CE%95_%CE%BA%CE%B5%CF%8618_%CE%A0%CF%81%CF%8C%CF%83%CE%B8%CE%B5%CF%83%CE%B7_%CE%BA%CE%B1%CE%B9_%CE%B1%CF%86%CE%B1%CE%AF%CF%81%CE%B5%CF%83%CE%B7_%CE%BA%CE%BB%CE%B1%CF%83%CE%BC%CE%AC%CF%84%CF%89%CE%BD.pdf


https://www.youtube.com/watch?v=hfCG9ws4h8Y