Begründen Sie, warum die folgenden Vektoren linear abh?ngig sind:
a) \(\quad \mathbf{a}=\left(\begin{array}{l}1 \\ 2 \\ 5\end{array}\right),
\quad \mathbf{b}=\left(\begin{array}{l}2 \\ 0 \\ 2\end{array}\right) . \quad
\mathbf{c}=\left(\begin{array}{l}0 \\ 0 \\ 0\end{array}\right)\)
b) \(\quad \mathbf{a}=\left(\begin{array}{l}1 \\ 0 \\ 1\end{array}\right),
\quad \mathbf{b}=\left(\begin{array}{r}3 \\ -1 \\ 4\end{array}\right), \quad
c=\left(\begin{array}{r}-3 \\ 0 \\ -3\end{array}\right)\)
c) \(\quad \mathbf{a}_{1}=\left(\begin{array}{l}1 \\ 0 \\\
1\end{array}\right), \quad \mathbf{a}_{2}=\left(\begin{array}{l}1 \\ 1 \\\
0\end{array}\right), \quad \mathbf{a}_{3}=\left(\begin{array}{r}0 \\ -2 \\\
2\end{array}\right)\)
d) \(\quad a=\left(\begin{array}{l}1 \\ 2\end{array}\right), \quad
b=\left(\begin{array}{l}3 \\ 1\end{array}\right), \quad
c=\left(\begin{array}{l}2 \\ 0\end{array}\right), \quad
d=\left(\begin{array}{l}-1 \\ -1\end{array}\right)\)