00580naa#a2200169#i#450# EN\\bibl\95373 20250601204202.7 2782-4586 20250228b2025####ek#y0engy0150####ca RU PROPAEDEUTICS OF ECONOMICS IN THE SCHOOL COURSE OF MATHEMATICS Journal article Moscow ITBO University 2025 4 с. Journal article local Математическая экономическая теория. 330.42 математики. 372.851 Kisel'nikov Igor' Vasil'evich jomeam.ru