00675naa#a2200181#i#4500001002200000005001700022011001400039100004100053101000800094102000700102200014000109210005100249215001000300608002700310675011300337700002800450856001500478EN\INFRA-M\bibl\2786020241106000002.3##a2500-3305##a20190312b2019####ek#y0engy0150####ca0#aRUS##aRU1#aThe state of basic learning activities in pupils with mental retardation on the example of solving arithmetic problemseJournal article1#aMoscowcINFRA-M Academic Publishing LLC.d2019##a6 с.##aJournal article2local##aОбразование. Воспитание. Обучение. Организация досуга. 37zRUS#1aSkiragElena Vasil'evna4#anaukaru.ru