\[\boxed{\text{1112.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\left( 9 - 4a^{2} \right)\left( \frac{4a}{2a - 3} - 1^{\backslash 2a - 3} \right) =\]
\[= \frac{\left( 9 - 4a^{2} \right)(4a - 2a + 3)}{2a - 3} =\]
\[= \frac{- (2a - 3)(2a + 3)(2a + 3)}{2a - 3} =\]
\[= - (2a + 3)^{2}\]
\[При\ a = - 1,2:\]
\[- \left( 2 \cdot ( - 1,2) + 3 \right)^{2} =\]
\[= - ( - 2,4 + 3)^{2} =\]
\[= - (0,6)^{2} = - 0,36.\]
\[Ответ:\ - 0,36.\]