X1+X2+2X2-X4=0打错,应该是X1+X2+2X3-X4=0
┏1 1 2 -1┓
┃-1 0 -3 2┃
┗2 1 5 -3┛→﹙行初等变换﹚→
┏1 0 3 -2┓
┃0 1 -1 1┃
┗0 0 0 0┛
通解﹛x1,x2,x3,x4﹜=a﹛-3,1,1,0﹜+b﹛2,-1,0,1﹜ [a.b是任意数]
X1+X2+2X2-X4=0打错,应该是X1+X2+2X3-X4=0
┏1 1 2 -1┓
┃-1 0 -3 2┃
┗2 1 5 -3┛→﹙行初等变换﹚→
┏1 0 3 -2┓
┃0 1 -1 1┃
┗0 0 0 0┛
通解﹛x1,x2,x3,x4﹜=a﹛-3,1,1,0﹜+b﹛2,-1,0,1﹜ [a.b是任意数]