Πρόσθεση ομώνυμων κλασμάτων
Πρόσθεση ομώνυμων κλασμάτων
Khan Academy original video: Adding Fractions with Like Denominators
http://www.khanacademy.org/math/arithmetic/fractions/v/adding-fractions-with-like-denominators
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http://amara.org/v/CL6Q/