\[\boxed{\text{31.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ c > 1:\]
\[c > \sqrt{c}.\]
\[\textbf{б)}\ 0 < c < 1:\]
\[c < \sqrt{c}.\]
\[Существует:\]
\[c = 0;\ \ c = 1.\]