\[\boxed{\mathbf{647.}ОК\ ГДЗ\ –\ домашка\ на\ 5}\]
\[\overrightarrow{a}\left\{ - 1;2;0 \right\};\ \ \overrightarrow{b}\left\{ 0; - 5; - 2 \right\};\ \ \]
\[\overrightarrow{c}\left\{ 2;1; - 3 \right\}.\]