x=2 y=-1 z=1
x+4y+z=-1=-x+2y+3z=-1=x-3y+2z=7 快~我马上就要,好心人帮帮忙~
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2x-y=7 x+y+z=25x+3y+z=2 x-2y+z=-1 3x-4z=4 x+2y+3z=-1x+y-z=6x
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1:7x+2y-z=7 2:6x-y+z=7 3:4x+3y+z=9 1：9x+4y+z+10 2：-9X+2y+3z=
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x-5y-3z=0 y+z-3x=3 x+y+3z=14 y+4z=3 z+x-3y=5 2x+y+z=7 2x-z=1
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2x+3y-z=4,3x-2y+3z=7,x+3y-2z=-1
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1.x+y+z=21,x-y=1,2x+z-y=13.2.3x+2y+z=13,x+y+2z=7 ,2z+3y-z=12
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x-2y+z=-1 3x+4y-2z=7 2x+2y-3z=6
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（1）y=2x-7 6x+3y+2z=2 3x-4z=4 (2) 4x+9y=12 3y-2z=1 7x+5z=19/4
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解下列方程组[要过程](1){X-y=3,(2){X+y=3,{X+Z=7,{y+Z=4,{y-Z=6.{Z+X=5.
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解方程组(1){3x+2y+z=7,2x+3y+4z=3,x+4y+6z=1
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y=2x-7 3y+2z=2 3x-4z=4和4x+9y=12 3y-2z=1 7x+5z=19/4