\[\boxed{\text{243\ (243).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ 2^{- 2} + 2^{- 1} = \frac{1}{4} + \frac{1^{\backslash 2}}{2} =\]
\[= \frac{1}{4} + \frac{2}{4} = \frac{3}{4}\]
\[2)\ 3^{- 2} - 6^{- 1} = \frac{1^{\backslash 2}}{9} - \frac{1^{\backslash 3}}{6} =\]
\[= \frac{2}{18} - \frac{3}{18} = - \frac{1}{18}\]
\[3)\ {0,03}^{0} + {0,7}^{0} = 1 + 1 = 2\]
\[4)\ \left( 9 \cdot 3^{- 3} - 12^{- 1} \right)^{- 1} =\]
\[= \left( 9 \cdot \frac{1}{27} - \frac{1}{12} \right)^{- 1} =\]
\[= \left( \frac{1^{\backslash 4}}{3} - \frac{1}{12} \right)^{- 1} =\]
\[= \left( \frac{3}{12} \right)^{- 1} = \frac{12}{3} = 4\]