\[\boxed{\text{923\ (923).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\text{M\ }(6;\ - 3):\]
\[1)\ x - y = 9\ \ \]
\[2)\ xy = - 18,\ \ \]
\[3)\ \frac{x}{y} = - 2.\]
\[\boxed{\text{923.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ x^{3} - 64x = 0\]
\[x\left( x^{2} - 64 \right) = 0\]
\[x(x - 8)(x + 8) = 0\]
\[x = 0;x = \pm 8.\]
\[x = \left\{ - 8;0;8 \right\}.\]
\[2)\ (x - 1)^{2} - 3x = x^{2} - 5x\]
\[x^{2} - 2x + 1 - 3x = x^{2} - 5x\]
\[0x = - 1\]
\[нет\ корней.\]
\[x = \left\{ \varnothing \right\}.\]