若2x+5y+4z=0 ,3x+y=0；则x+y-z=?

若{x+3y+10z=0 则 (x+y-z)/(x-y+z) 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程 若2x+5y+4z=0 ,3x+y=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 已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y- 若x-2y+4z=1,x+3y-7z=0,则y:z=? x-3y+z=0,3x-2y-4z=0,则x:y:z=多少? 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{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?