\[\boxed{\text{19\ (19).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[y = x^{2}:\ \ \]
\[D(y) = R;\ \ \]
\[E(y) = \lbrack 0;\ + \infty).\]
\[y = x^{3}:\ \]
\[D(y) = R;\ \ \ \]
\[E(y) = R.\]
\[y = \sqrt{x}:\]
\[D(y) = \lbrack 0; + \infty);\ \ \ \]
\[E(y) = \lbrack 0; + \infty).\]
\[\boxed{\text{19.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ x < 3\]
\[\textbf{б)} - 2 < x < 4\]
\[\textbf{в)}\ x \geq 1\]
\[\textbf{г)}\ 5 \leq x \leq 7,5\]
\[\textbf{д)}\ 0 < x \leq 2,5\]
\[\textbf{е)}\ x \geq 10,5\ \]