00601naa#a2200169#i#4500001001600000005001700016011001400033100004100047102000700088200009600095210011000191215001000301608002700311675003400338700002900372856003000401EN\\bibl\12756320260717135950.5##a1994-4683##a20231031b2023####ek#y0engy0150####ca##aRU1#aFEATURES OF ORGANIZING EXTRACURRICULAR ACTIVITIES IN MATHEMATICS AT SCHOOLeJournal article1#aMoscowcNational State University of Physical Education, Sports and Health named after P.F. Lesgaftd2023##a3 с.##aJournal article2local##aматематики. 372.851#1aLaninagSvetlana Yurevna4#auchzapiski.lesgaft.spb.ru