5x+4y+z=0 3x+y-4z=13 x+y+z=—2
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
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-
已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=——
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/x-y+z的值.
已知3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z)
2x+3y-4z=0,3x+4y+5z=0,求x+y-z/x-y+z的值
2x+3y-4z=0.,3x+4y+5z=0,则x+y+z/x-y+z详细的解题过程
已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值