Вопрос:

Ответ:

\[y = \sqrt{5x - x^{2}}\]

\[5x - x^{2} \geq 0\]

\[x^{2} - 5x \leq 0\]

\[x(x - 5) \leq 0\]

\[D(y) = \lbrack 0;5\rbrack.\]