x+2y-3z=0,5x-6y+7z=0,则x∶y∶z=____.
2x+5y+4z=0,3x+y-7z=0,则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
若{x+3y+10z=0 则 (x+y-z)/(x-y+z)
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
已知x-y+z=0,3x+y-5z=0,则x+y+z/x+2y-3z=?
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知x-y+z=0.3x+y-5z=0,则x+y+z/x+2y-3z=_______
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程