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https://digiscapes.org/2017/04/15/%cf%84%ce%bf-%ce%b8%ce%b5%cf%8e%cf%81%ce%b7%ce%bc%ce%b1-%cf%84%ce%b7%cf%82-%ce%bc%ce%ad%cf%83%ce%b7%cf%82-%cf%84%ce%b9%ce%bc%ce%ae%cf%82/
Το θεώρημα της μέσης τιμής