已知/x+2y/+根号3x-7+(5y+z)²=0 求x-3y+4z的值

已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 已知/x+2y/+根号3x-7+(5y+z)²=0 求x-3y+4z的值 已知x、y、z满足：根号下3x-2y-4+根号下2x-7y+3=根号下2x-4y-z·根号下z-2x+4y,求z的值. 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x>根号x-5+根号5-x+x且|y²-36|+根号2x-y-z=0,求根号y-x+根号z的值 已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值 已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值. 已知2x+3y-4z=0,3x+3y+5z=0,求x+y+x/x-y+z的值 已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值