x+2y-z=3 2x+y+3z=0 4x+z=-4
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
x+y+z=4 x-2y+z=-2 x+2y+3z=0求解
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
x+2y-4z=0 3x+y-z=0,则x:y:z=
x+2y-4z=0,3x+y-z=0,则x:y:z=?::
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
已知x+2y-4z=0,3x-y-z=0,则3x+2y+z/x+2y+z=
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)