\[\boxed{\mathbf{1577}\mathbf{.}}\]
\[1)\ \sqrt{2x - 7} \leq \sqrt{6x + 13}\]
\[2x - 7 \leq 6x + 13\]
\[- 4x \leq 20\]
\[x \geq - 5.\]
\[Имеет\ смысл\ при:\]
\[2x - 7 \geq 0\]
\[2x \geq 7\]
\[x \geq 3,5.\]
\[6x + 13 \geq 0\]
\[6x \geq - 13\]
\[x \geq - 2\frac{1}{6}.\]
\[Ответ:\ \ x \geq 3,5.\]
\[2)\ \sqrt{3 - x} < \sqrt{3x - 5}\]
\[3 - x < 3x - 5\]
\[- 4x < - 8\]
\[x > 2.\]
\[Имеет\ смысл\ при:\]
\[3 - x \geq 0\]
\[x \leq 3.\]
\[3x - 5 \geq 0\]
\[3x \geq 5\]
\[x \geq 1\frac{2}{3}.\]
\[Ответ:\ \ 2 < x \leq 3.\]