\[\boxed{\mathbf{801}\mathbf{.}}\]
\[1)\ 5^{\frac{\lg 625}{\lg 25}} = 5^{\log_{25}625} =\]
\[= 5^{\log_{25}25^{2}} = 5^{2} = 25\]
\[2)\log_{\frac{1}{4}}\left( \log_{3}4 \bullet \log_{2}3 \right) =\]
\[= \log_{\frac{1}{4}}\left( \frac{\lg 4}{\lg 3} \bullet \frac{\lg 3}{\lg 2} \right) =\]
\[= \log_{\frac{1}{4}}\frac{\lg 4}{\lg 2} = \log_{\frac{1}{4}}{\log_{2}4} =\]
\[= \log_{\frac{1}{4}}{\log_{2}2^{2}} = \log_{\frac{1}{4}}2 =\]
\[= \log_{\frac{1}{4}}4^{\frac{1}{2}} = \log_{\frac{1}{4}}\left( \frac{1}{4} \right)^{- \frac{1}{2}} =\]
\[= - \frac{1}{2} = - 0,5\]