Ur�ete absolutn� a lok�ln� extr�my funkce
$$
f(x,y,z)= x^2+y^2+z^2
$$
na mno�in�
$$
M=\{(x,y,z)\in\RR^3;\,\frac{x^2}{a^2}+\frac{y^2}{b^2}+
\frac{z^2}{c^2}\leq1,\},\,a>b>c.
$$
