\[\boxed{\text{1201.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ 8^{- 2} \cdot 4³ = \left( 2^{3} \right)^{- 2} \cdot \left( 2^{2} \right)^{3} =\]
\[= 2^{- 6} \cdot 2^{6} = 2^{- 6 + 6} = 2^{0} = 1\]
\[\textbf{б)}\ 9^{- 6} \cdot 27^{5} = \left( 3^{2} \right)^{- 6} \cdot \left( 3^{3} \right)^{5} =\]
\[= 3^{- 12} \cdot 3^{15} = 3^{- 12 + 15} =\]
\[= 3³ = 27\]
\[\textbf{в)}\ 10^{0}\ :10^{- 3} = 10^{0 - ( - 3)} =\]
\[= 10³ = 1000\]
\[\textbf{г)}\ 125^{- 4}\ :25^{- 5} =\]
\[= \left( 5^{3} \right)^{- 4}\ :\left( 5^{2} \right)^{- 5} =\]
\[= 5^{- 12}\ :5^{- 10} = 5^{- 12 - ( - 10)} =\]
\[= 5^{- 2} = \frac{1}{5^{2}} = \frac{1}{25}\]
\[\textbf{д)}\ \frac{2^{- 21}}{4^{- 5} \cdot 4^{- 6}} = \frac{2^{- 21}}{2^{- 10} \cdot 2^{- 12}} =\]
\[= 2^{- 21 - ( - 10) - ( - 12)} =\]
\[= 2^{- 21 + 10 + 12} =\]
\[= 2^{- 21 + 22} = 2^{1} = 2\]
\[\textbf{е)}\ \frac{4^{- 2} \cdot 8^{- 6}}{2^{- 22}} = \frac{2^{- 4} \cdot 2^{- 18}}{2^{- 22}} =\]
\[= 2^{- 4 + ( - 18) - ( - 22)} = 2^{- 4 - 18 + 22} =\]
\[= 2^{- 22 + 22} = 2^{0} = 1\]
\[\textbf{ж)}\ \frac{3^{- 10} \cdot 9^{8}}{( - 3)^{2}} = \frac{3^{- 10} \cdot 3^{16}}{3^{2}} =\]
\[= 3^{- 10 + 16 - 2} = 3^{4} = 81\]
\[\textbf{з)}\ \frac{5^{- 5} \cdot 25^{10}}{125^{3}} = \frac{5^{- 5} \cdot 5^{20}}{5^{9}} =\]
\[= 5^{- 5 + 20 - 9} = 5^{6} = 15\ 625\]