%0 Journal Article %A N. V. Dubovitskaya %A V. M. Imaykin %T Certain problems from old issues of “Mathematical Education" %J Matematičeskoe obrazovanie %D 1997 %P 76-78 %N 1 %U http://geodesic.mathdoc.fr/item/MO_1997_1_a4/ %G ru %F MO_1997_1_a4