\[\boxed{\mathbf{983\ (983).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\left\{ \begin{matrix} y - x^{2} = 3 \\ x + y = 5 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\left\{ \begin{matrix} y = x² + 3 \\ y = 5 - x \\ \end{matrix} \right.\ \]
\[x\] | \[2\] | \[3\] |
---|---|---|
\[y\] | \[3\] | \[2\] |
\[Ответ:( - 2;7);\ \ (1;4).\]
\[2)\ \left\{ \begin{matrix} x - y = 7 \\ xy = - 12 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} y = x - 7 \\ y = - \frac{12}{x} \\ \end{matrix} \right.\ \]
\[x\] | \[4\] | \[5\] |
---|---|---|
\[y\] | \[- 3\] | \[- 2\] |
\[x\] | \[\pm 4\] | \[\pm 3\] |
---|---|---|
\[y\] | \[\pm 3\] | \[\pm 4\] |
\[Ответ:(4;\ - 3);\ \ (3;\ - 4).\]
\[3)\ \left\{ \begin{matrix} y = x^{2} - 4 \\ y = - x^{2} + 4x - 4 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\text{\ \ }\left\{ \begin{matrix} y = x² - 4 \\ y = - (x - 2)² \\ \end{matrix} \right.\ \]
\[Ответ:(2;0);\ \ (0;\ - 4).\]
\[4)\ \left\{ \begin{matrix} x^{2} + y^{2} = 25 \\ y = x^{2} - 5 \\ \end{matrix} \right.\ ,\ \ \]
\[(0;0),\ \ R = 5\]
\[Ответ:(0;\ - 5);( - 3;4);(3;4).\]