336x280(권장), 300x250(권장), 250x250, 200x200 크기의 광고 코드만 넣을 수 있습니다.

row echelon form (ref)
![\left[ \begin{array}{ccc|c} 2 & 1 & -1 & 8 \\ 0 & \frac{1}{2} & \frac{1}{2} & 1 \\ 0 & 0 & -1 & 1 \end{array} \right]](http://upload.wikimedia.org/math/5/e/7/5e7f58b182c0ddc29e38ee7ce17161cc.png)
reduced row echelon form (rref)
![\left[ \begin{array}{ccc|c} 1 & 0 & 0 & 2 \\ 0 & 1 & 0 & 3 \\ 0 & 0 & 1 & -1 \end{array} \right]](http://upload.wikimedia.org/math/f/2/9/f2981fd8dffb705698e90dbcfcea25d5.png)
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