\[24ab + 32a - 3b - 4 =\]
\[= 8a \cdot (3b + 4) - (3b + 4) =\]
\[= (3b + 4) \cdot (8a - 1)\]
\[при\ a = 0,3;b = - 1\frac{2}{3} = - \frac{5}{3}:\]
\[\left( - \frac{3 \cdot 5}{3} + 4 \right) \cdot (8 \cdot 0,3 - 1) =\]
\[= ( - 5 + 4) \cdot (2,4 - 1) =\]
\[= - 1 \cdot 1,4 = - 1,4.\]
\[Ответ:\ - 1,4.\ \]