\[\boxed{\text{320\ (320).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ \left( 4a^{3} - 8 \right) - \ *\ = - 4\]
\[*\ = 4a^{3} - 8 - ( - 4)\]
\[*\ = 4a^{3} - 8 + 4\]
\[*\ = 4a^{3} - 4.\]
\[2)\ (4a^{3} - 8) - \ *\ = 9\]
\[*\ = 4a^{3} - 8 - 9\]
\[* = 4a^{3} - 17.\]
\[3)\ \left( 4a^{3} - 8 \right) - \ *\ = - 2a^{3}\]
\[*\ = 4a^{3} - 8 - \left( - 2a^{3} \right)\]
\[*\ = 4a^{3} - 8 + 2a^{3}\]
\[*\ = 6a^{3} - 8.\]
\[4)\ (4a^{3} - 8) - \ *\ = 3a\]
\[*\ = 4a^{3} - 8 - 3a\]
\[*\ = 4a^{3} - 3a - 8\text{.\ }\]