2x+z=10 x+y-z=4 3x-y-z=0
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2x+z=10 x+y-z=4 3x-y-z=0
![2x+z=10 x+y-z=4 3x-y-z=0](/uploads/image/z/20072106-18-6.jpg?t=2x%2Bz%3D10+x%2By-z%3D4+3x-y-z%3D0)
x+y-z=4 3x-y-z=0
两式相加 4X-2Z=4
2X-Z=2
Z=2X-2
带入2X+Z=10
所以 2X+2X-2=10
4X=12
X=3
Z=2*3-2=4
3+Y-4=4
Y=5
两式相加 4X-2Z=4
2X-Z=2
Z=2X-2
带入2X+Z=10
所以 2X+2X-2=10
4X=12
X=3
Z=2*3-2=4
3+Y-4=4
Y=5
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(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)
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
(x+y-z)(x-y+z)=
若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
x+2y+3z=10,x-y+4z=10,x+3y+2z=2
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
x-y+4z=10,x+3y+2z=2,x+2y+3z=11.
x+y+z=4 2x+3y-z=6 3x+2y+2z=10
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?