已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,
已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
已知x+2y-3z=0,2x+3y+5z=0,求(x+y+z)除以(x-y+z)
已知x除以2=y除以3=z除以4,且x≠0,求x+y+z除以x-2y+3z的值,
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{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/x-y+z的值.
已知3x+4y+5z=0,2x+3y-4z=0,求(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3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z