media-share-0-02-05-f2edaa222f36cd5f0bce0bfc3a7012bb5501e734f6fd9a37178c69dd9f42058b-e7d22fa8-b097-435a-831b-b88929e8559e Published 13/12/2018 at 1280 × 960 in Математика без граници – Есен 2018г.
