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how to present this matrix as a multiplication of elementary matrices

[tex]

\bigl(\begin{smallmatrix}

0 &6 &2 \\

1& 1 &0 \\

5&3 &1

\end{smallmatrix}\bigr)

[/tex]

i cant understand in general what are they doing in this solution

http://img144.imageshack.us/img144/9508/34036247.th.gif [Broken]

??

[tex]

\bigl(\begin{smallmatrix}

0 &6 &2 \\

1& 1 &0 \\

5&3 &1

\end{smallmatrix}\bigr)

[/tex]

i cant understand in general what are they doing in this solution

http://img144.imageshack.us/img144/9508/34036247.th.gif [Broken]

??

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