若x/2=y/3=z/4,则x+y+z/x=多少?
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
若x:3=y:4=z:5,且3x-2y+2z=18,则2x+5y-3z=多少
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
若x-2y+4z=1,x+3y-7z=0,则y:z=?
若x/3=y/2=z/5,则2x-3y-z/x-y+z=
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
已知,x/2=y/3=z/4,则(2x+y-z)/(3x-2y+z)=?
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=?::