\[\boxed{\text{229\ (229).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ если\ a = - \frac{1}{6}:\]
\[18a^{2} = 18 \cdot \left( - \frac{1}{6} \right)^{2} = \ \frac{18 \cdot 1}{36} =\]
\[= \frac{1}{2} = 0,5.\]
\[2)\ если\ a = - \frac{1}{6}:\]
\[\left( 18a^{2} \right) = \left( 18 \cdot \left( - \frac{1}{6} \right) \right)^{2} =\]
\[= ( - 3)^{2} = 9.\]
\[3)\ если\ b = - 2:\]
\[6 + b^{4} = 6 + ( - 2)^{4} =\]
\[= 6 + 16 = 22.\]
\[4)\ если\ b = - 2,:\ \]
\[(6 + b)^{4} = (6 - 2)^{4} =\]
\[= 4^{4} = 256.\]