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$[\begin{array}{c} 3 & 7 & 9 & 0 \\ 1 & 2 & 3 & 2 \\ 1 & 4 & 1 & 2 \end{array}]$

Bước 1

Transpose the matrix by switching its rows to columns.

$[\begin{array}{c} 3 & 1 & 1 \\ 7 & 2 & 4 \\ 9 & 3 & 1 \\ 0 & 2 & 2 \end{array}]$