\[\boxed{\mathbf{587\ (587).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\left\{ \begin{matrix} y = 1\ \ \\ y = \sqrt{x} \\ \end{matrix} \right.\ \]
\[1 = \sqrt{x}\]
\[x = 1\]
\[\text{A\ }(1;1).\]
\[2)\ \left\{ \begin{matrix} y = 0,8 \\ y = \sqrt{x} \\ \end{matrix} \right.\ \]
\[0,8 = \sqrt{x}\]
\[x = {0,8}^{2}\]
\[x = 0,64\]
\[\text{B\ }(0,64;0,8).\]
\[3)\ y = - 6\]
\[y = \sqrt{x}\]
\[- 6 = \sqrt{x}\]
\[нет\ точки\ пересечения.\]
\[4)\ \left\{ \begin{matrix} y = 500 \\ y = \sqrt{x} \\ \end{matrix} \right.\ \]
\[500 = \sqrt{x}\]
\[x = 250\ 000\]
\[\text{C\ }(250000;500).\]