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arvutama ilma arve ja tehteid kirjutamata ning kalkulaatorit vm abivahendeid kasutamata
вычислять в уме . Huviharidussõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//has/%D0%B2%D1%8B%D1%87%D0%B8%D1%81%D0%BB%D1%8F%D1%82%D1%8C%20%D0%B2%20%D1%83%D0%BC%D0%B5/1/rus (30.08.2026)
