x/2=y/3=z/4,则x+2y-z/z=?
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
已知,x/2=y/3=z/4,则(2x+y-z)/(3x-2y+z)=?
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知2x+5y+4z=15.7x+y+3z=14 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
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
已知x+2y-4z=0,3x-y-z=0,则3x+2y+z/x+2y+z=
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——