\[\boxed{\mathbf{663.}ОК\ ГДЗ\ –\ домашка\ на\ 5}\]
\[Формула:\]
\[|\overrightarrow{AB|} = \sqrt{x_{\text{AB}}^{2} + y_{\text{AB}}^{2} + z_{\text{AB}}^{2}} =\]
\[\textbf{а)}\ A( - 1;0;2);\ \ B(1; - 2;3).\]
\[\textbf{б)}\ A( - 35; - 17;20);\ \ \]
\[B( - 34; - 5;8).\]
\[= \sqrt{1 + 144 + 144} = \sqrt{289} =\]
\[= 17.\]