Description: [ Question description ] known system of linear equations AX=B,
solves this system of equations. Reference algorithm: 娑堝幓娉? Will
arrange in order vector B to add to matrix A last the row,
constitution augmentation matrix AB. Carries on the following three
kind of elemetary operations to AB, causes original matrix A in the
part principal diagonal element is 1, other elements are 0, then the
original row vector B part is X value: 1. a matrix line while take as
0 several 2. adds on a matrix line in another line of multiples 3.
exchanges matrices two lines of positions
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