4x-3y-z=-11,2x+2y+z=11,-2x+5y-2z=6

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/29 04:02:14

（1）+(2）得
6x-y=0 (4)
(2)×2+(3)得
2x+9y=28 (5)
(4)×9+(5)得
56x=28
∴x=1/2
把x=1/2代入(4)得
6x-y=0
y=3
把x=1/2,y=3代入(1)得
2-9-z=-11
∴z=4
∴方程组的解是
x=1/2
y=3
z=4

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x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) x/2=y/3=z/5 x+3y-z/x-3y+z x+2y+4z=17 2x+y+z=7 3x+y+2z=11 2x+3y+z=11,3x+y-z=2,x+y+z=6求解 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.