几道分式题目1.已知4x-3y-6z=0,x+2y-7z=0(xyz不等于0),则2x^2+3y^2+6z^2/x^2+

几道分式题目1.已知4x-3y-6z=0,x+2y-7z=0(xyz不等于0),则2x^2+3y^2+6z^2/x^2+ 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 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 已知方程组4x-y+3z=0,2x+y+6z=0.且xyz不等于0,则x:y:z= 方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z) 已知方程组2x-3y+z=0 3x-2y-6z=0 且xyz不等于0求 x:y:z 已知x+4y-3z=0,4x-5y+2z=0(xyz不等于0),则x:y:z=? 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不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值. 已知4x-3y-6z=0,x+2y-7z=0(xyz不等于0)则2x方+3x方+6x方/x方+5y方+7z方的值为( ) 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满足|3x-2y+z|+|2x+y+2z|=0（xyz不等于o）求x+y除以z