X=-2 Y=1 Z=0.5
解方程组 3x-y=-7 y+2z=2 2x-2z=-5
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解方程组｛3X-Y=-7①,Y+2Z=2②,2X-2Z=-5③
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解方程组 2x+3y-z=5 x-2y+2z=6 3x-y-3z=7
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解方程组1.2x+y+z=7 2.x+2y+z=5 3.x+y+2z=4
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解方程组3x+y+2z=8,x+y+z=5,2x+3y+4z=7
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解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
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解方程组x:y=5:3 x:z=7:2 x-2y+3z=4
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解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
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解方程组x+y+z=6,2x+3y-z=5,3x-y+2x=7
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解方程组{x+2y+z=4 2x+y+2z=5 x+y+3z=5