\[\boxed{\mathbf{928.ОК\ ГДЗ - домашка\ на}\ 5}\]
\[\overrightarrow{a}\ \left\{ 3;7 \right\};\ \overrightarrow{b}\left\{ - 2;1 \right\};\ \overrightarrow{c}\ \left\{ 6;14 \right\};\ \]
\[\overrightarrow{d}\ \left\{ 2;\ - 1 \right\};\ \overrightarrow{e}\ \left\{ 2;4 \right\}\]
\[По\ лемме\ о\ коллинеарных\ \]
\[векторах:\]
\[1)\ \overrightarrow{a}\ и\ \overrightarrow{c}\ :\ \overrightarrow{c} = 2 \bullet \overrightarrow{a}.\]
\[2)\ \overrightarrow{b}\ и\ \overrightarrow{d}\ :\ \overrightarrow{b} = - 1 \bullet \overrightarrow{d}.\ \]
\[\mathbf{Параграф\ }2\mathbf{.\ Простейшие\ задачи\ в\ координатах}\]
\[\boxed{\mathbf{928.еуроки - ответы\ на\ пятёрку}}\]
\[\textbf{а)}\ \overrightarrow{\text{AB}},\overrightarrow{\text{CD}}\ и\ \overrightarrow{\text{EF}} - коллинеарны;\ \]
\[\left| \overrightarrow{\text{AB}} \right| = 1\ см;\ \left| \overrightarrow{\text{CD}} \right| = 2,5\ см;\ \]
\[\left| \overrightarrow{\text{EF}} \right| = 4,5\ см;\]
\[\textbf{б)}\ \overrightarrow{\text{AB}}\ и\ \overrightarrow{\text{EF}} - коллинеарны,\]
\[\ \overrightarrow{\text{AB}}\ и\ \overrightarrow{\text{CD}} - не\ коллинеарны;\ \]
\[\left| \overrightarrow{\text{AB}} \right| = 1\ см;\left| \overrightarrow{\text{CD}} \right| = 2,5\ см;\]
\[\left| \overrightarrow{\text{EF}} \right| = 4,5\ см;\]