\[\boxed{\text{491\ (491).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ {0,6}^{2} > {0,6}^{3}\]
\[\textbf{б)}\ {1,5}^{2} < {1,5}^{3}\]
\[\textbf{в)}\ {2,7}^{2} < {2,7}^{3}.\]