η έλλειψη [math](c): β^2x^2+α^2y^2=α^2β^2[/math] και μία εφαπτόμενή της
Θάσος
12 Απριλίου 2008
sonom
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- Target Group (Age)
- 15 – 18
- Language
- Greek / Ελληνικά
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