
\begin{enumerate}
\item $\vv{u}=\vv{AC}+\vv{BA}+\vv{CB}$\\
$\vv{u}=\vv{AC}+\vv{CB}+\vv{BA}$\\
$\vv{u}=\vv{AB}+\vv{BA}$\\
$\vv{u}=\vv{AA}$\\
\underline{$\vv{u}=\vv{0}$}

\item $\vv{v}=\vv{DE}-\vv{DF}+\vv{EF}-\vv{ED}$\\
$\vv{v}=\vv{DE}+\vv{FD}+\vv{EF}+\vv{DE}$\\
$\vv{v}=\vv{DE}+\vv{EF}+\vv{FD}+\vv{DE}$\\
$\vv{v}=\vv{DF}+\vv{FE}$\\
\underline{$\vv{v}=\vv{DE}$}

\item $\vv{w}=\vv{BA}+\vv{MA}-\vv{MB}$\\
$\vv{w}=\vv{BA}+\vv{MA}+\vv{BM}$\\
$\vv{w}=\vv{BA}+\vv{BM}+\vv{MA}$\\
$\vv{w}=\vv{BA}+\vv{BA}$\\
\underline{$\vv{w}=2\vv{BA}$}
\end{enumerate}