已知3x-2y-5z=0,x+2y+-7z=0且xyz ≠0求(x*-2y*+z)/yz

已知3x-2y-5z=0,x+2y+-7y=0 且xyz 不等于0求(x*x-2y*y+z*z)/yz (x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2 已知：(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z) 已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz 已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值. 已知x+y-7z=0 x-2y+5z=0(xyz不等于0）,求x+2y-z/y-2x+12z 已知 xyz≠0,且x+3y+z＝0,2x+3y-z=0,求x+2y-7z/3x+5y+z 的值.. 已知:2x-3y+z=0,3x-2y=6z,且xyz≠0,求x^2+y^2+z^2/xy+yz+xz的值.PS:不会的别 已知2x-3y+z=0,3x-2y-6z=0且xyz≠0,求(x的平方+y的平方+z的平方）／（xy+yz+xz）的值 已知方程组x-3y-2z=0 2x-y+z=0 且xyz≠0,求x：y：z 已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z 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