解方程组x-2y=-9 y-z=3 2z+x=47
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解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9
x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组
解方程组x-2y=-9 y-z=3 2z+x=47
方程组2x+3y-z=9 x+y+z=15 5方程组2x+3y-z=9 x+y+z=15 5x-4y-z=0的解,
解方程组:2x+y+z=-4 x+2y+z=-2 x+y+2z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 x+y+z=2 x-2y+z=-1 x+2y+3z=-1
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组 :X+Y-3Z=1 Y+Z-3X=2 Z+X-3Y=3
方程组3x+y+2z=10,2x+3y-z=9,x+y+z=6
3x-y+z=3,2x+3y-z=12,x+y+z=6解方程组
解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5
方程组3x-y-z=9,2x+y-2z=6,x+y+z=15
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
解方程组2x+3y-z=12,3x-y+z=4,x+y+z=6
解方程组x+y/2=z+x/3=y+z/4①x+y+z=27②