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põhiarv 30
тридцать . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%82%D1%80%D0%B8%D0%B4%D1%86%D0%B0%D1%82%D1%8C/1/rus (10.08.2026)