TY JOUR TI Optimization problems in school textbooks on mathematics KW maximum KW minimum KW unconditional and conditional extremes KW optimization problem KW objective function KW set of admissible solutions KW stationary and critical points KW Weierstrass theorem. JO Journal of Natural Sciences Research AU Musin, N.M. PY 2017 IS 2 PB INFRA-M Academic Publishing LLC.