\[\sqrt{5x - 11} + \sqrt{2x - 7}\]
\[\ \left\{ \begin{matrix} 5x - 11 \geq 0 \\ 2x - 7 \geq 0\ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} 5x \geq 11\ \\ 2x \geq 7\ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ }\]
\[\left\{ \begin{matrix} x \geq 2,2 \\ x \geq 3,5 \\ \end{matrix} \right.\ \]
\[Ответ:\ \lbrack 3,5; + \infty).\]