要过程越详细越好 谢谢
X+Y+Z=2
3X-Y-4Z=5
2X+3Y-2Z=0
要过程越详细越好 谢谢
X+Y+Z=2
3X-Y-4Z=5
2X+3Y-2Z=0
X+Y+Z=2 1
3X-Y-4Z=5 2
2X+3Y-2Z=0 3
1+2: 4x-3z=7
3*1-3 x+5z=6
(20+3)z=24-7
z=17/23
X+Y+Z=2①
3X-Y-4Z=5②
2X+3Y-2Z=0③
②+①得
4X-3Z=7④
①x3-③
X+5Z=6⑤
⑤x4-④
23Z=17
Z=17/23
把Z=1代入⑤
X+5x17/23=6
X=53/23
把X=53/23,Z=17/23代入①
Y=-24/23
X+Y+Z=2...............1
3X-Y-4Z=5.............2
2X+3Y-2Z=0............3
1式+2式得4x-3z=7..............4
2式×3+3式得11x-14z=15...........5
4式×11-5式×4 得 z=17/23
把z的值代入4式得x=53/23
把x和z的值代入1式得,y=-58/23