\[\sqrt{3x + 5} + \frac{1}{\sqrt{8 - 5x}}\]
\[\ \left\{ \begin{matrix} 3x + 5 \geq 0 \\ 8 - 5x > 0 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 3x \geq - 5 \\ 5x < 8\ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} x \geq - 1\frac{2}{3} \\ x < 1,6\ \ \ \\ \end{matrix} \right.\ \]
\[Ответ:\left\lbrack - 1\frac{2}{3};1,6 \right).\]