X+2Y= -12X+Y+Z= 1-X+Y-Z= -1

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X+2Y=-12X+Y+Z=1-X+Y-Z=-1X+2Y=-12X+Y+Z=1-X+Y-Z=-1X+2Y=-12X+Y+Z=1-X+Y-Z=-1X+2Y=-1……①2X+Y+Z=1……②-X+Y-Z=

X+2Y= -12X+Y+Z= 1-X+Y-Z= -1
X+2Y= -1
2X+Y+Z= 1
-X+Y-Z= -1

X+2Y= -12X+Y+Z= 1-X+Y-Z= -1
X+2Y= -1……①
2X+Y+Z= 1……②
-X+Y-Z= -1……③
②+③得:X+2Y=0……④
①与④矛盾,本方程组无解.

亲无图无真相哦!