Geodesic
Encouraging the student
Matematičeskoe obrazovanie, Tome 99 (2021) no. 3, pp. 14-20.

Voir la notice de l'article provenant de la source Math-Net.Ru

The first part of the article discusses problems with a parameter for preparing for the Unified State Exam. The second deals with geometric problems solved by the method of coordinates. 
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S. V. Dvoryaninov. Encouraging the student. Matematičeskoe obrazovanie, Tome 99 (2021) no. 3, pp. 14-20. http://geodesic.mathdoc.fr/item/MO_2021_99_3_a2/

[1] I.V. Yaschenko i dr., EGE 2020. Matematika. Profilnyi uroven. 50 variantov, Seriya “EGE. 50 variantov. Testy ot razrabotchikov”, Izdatelstvo “Ekzamen”, MTsNMO, M., 2020