\[\boxed{\text{86.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ \left( \frac{2}{3} \right)^{- 4} = \left( \frac{3}{2} \right)^{4};\ \]
\[\ \left( \frac{3}{2} \right)^{- 4} = \left( \frac{2}{3} \right)^{4};\ \ \left( \frac{3}{2} \right)^{0} = 1\]
\[В\ порядке\ убывания:\]
\[\left( \frac{2}{3} \right)^{- 4};\ \left( \frac{3}{2} \right)^{0};\ \frac{2}{3};\ \ \left( \frac{3}{2} \right)^{- 4}\text{.\ }\]
\[\textbf{б)}\ (2,5)^{- 3} = \left( \frac{5}{2} \right)^{- 3} = \left( \frac{2}{5} \right)^{3};\ \]
\[\ (2,5)^{- 5} = \left( \frac{2}{5} \right)^{5};\ \ (2,5)^{0} = 1\]
\[В\ порядке\ убывания:\]
\[2,5;\ \ (2,5)^{0};\ \ (2,5)^{- 3};\ \ \ (2,5)^{- 5}.\]
\[\textbf{в)}\ \left( \frac{4}{9} \right)^{- 5} = \left( \frac{9}{4} \right)^{5};\ \]
\[\text{\ \ }\left( \frac{4}{9} \right)^{- 6} = \left( \frac{9}{4} \right)^{6};\ \ \left( \frac{4}{9} \right)^{0} = 1\]
\[\left( \frac{4}{9} \right)^{- 6};\ \ \left( \frac{4}{9} \right)^{- 5};\ \ \left( \frac{4}{9} \right)^{0};\ \ \frac{4}{9}.\]