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https://liveyourmaths.com/2016/07/28/%cf%84%ce%b1-%cf%80%ce%ac%ce%bd%cf%89-%ce%ba%ce%ac%cf%84%cf%89-%cf%83%cf%84%ce%b9%cf%82-%cf%86%ce%b5%cf%84%ce%b9%ce%bd%ce%ad%cf%82-%ce%b2%ce%ac%cf%83%ce%b5%ce%b9%cf%82/
Τα πάνω κάτω στις φετινές βάσεις