\[\boxed{\text{922\ (922).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ \text{A\ }( - 2;2):\ \ \]
\[x + y = 0;\]
\[2)\ B\ (4;\ - 1):\ \]
\[2x + y = 7;\]
\[3)\ \text{C\ }(0;0):\ \ \]
\[x² + y² = 0.\]
\[\boxed{\text{922.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ (x - 3)\left( x^{2} - 9 \right) = 0\]
\[(x - 3)(x - 3)(x + 3) = 0\]
\[x = \pm 3.\]
\[x = \left\{ - 3;3 \right\}.\]
\[2)\ x^{2} + 4 = 0\]
\[x^{2} = - 4\]
\[нет\ корней.\]
\[x = \left\{ \varnothing \right\}.\]