00597naa#a2200169#i#450# EN\\bibl\124415 20260531025510.7 2782-4586 20260530b2026####ek#y0engy0150####ca RU Economic efficiency of digital educational technologies in improving the accessibility of education and reducing the aggregate costs of the education system Journal article Moscow ITBO University 2026 12 с. Journal article local Revyakina Elena Aleksandrovna Gazizov Andrey Ravilevich jomeam.ru