Elementary transformations of matrices:
Definition:Applying the following three transformations to the rows (columns) of a matrix becomes the
elementary transformation of the matrix:
(1) Swap the positions of two rows (columns) in a matrix;
(2) Using non-zero constants λ Multiply a certain row (column) of a matrix;
(3) Convert a row (column) of a matrix γ Multiply to another row (column) of the matrix.