\[\boxed{\text{249}\text{\ (249)}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 5^{100} > 4^{100};\ \ так\ как\ 5 > 4;\ \]
\[\textbf{б)}\ {0,87}^{100} < {0,89}^{100};\ \ \]
\[так\ как\ \ \ \ 0,87 < 0,89;\]
\[\textbf{в)}\ {1,5}^{261} < {1,6}^{261};\ \ \]
\[так\ как\ \ 1,5 < 1,6;\]
\[\textbf{г)}\ \left( \frac{2}{3} \right)^{261} > \left( \frac{3}{5} \right)^{261};\ \ \]
\[так\ как\ \ \frac{2}{3} > \frac{3}{5}\text{.\ }\]