\[\boxed{\text{262}\text{\ (262)}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ y = \sqrt{0,1x - 2}\]
\[0,1x - 2 \geq 0\]
\[0,1x \geq 2\]
\[x \geq 20.\]
\[\textbf{б)}\ y = \sqrt[4]{5 - 2x}\]
\[5 - 2x \geq 0\]
\[2x \leq 5\]
\[x \leq 2,5.\]
\[\textbf{в)}\ y = \sqrt[3]{8x + 1}\]
\[x \in ( - \infty;\ + \infty)\text{.\ }\]