若4x-3y-6z=0,x+2y-7z=0且xyz≠0； ①求x：y：z ； ②求(2x^2+3y^2+6z^2)/(x

若4x-3y-6z=0,x+2y-7z=0且xyz≠0； 求(2x+3y+6z)/(x+5y+7z)的值? 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 若xyz不等于0,且x+2y-7z=0,4x-3y-6z=0,求x+2y+z/x-2y-z的值? 已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值 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4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 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. x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值 设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值 已知方程组2x-3y+z=0 3x-2y-6z=0 且xyz不等于0求 x:y:z 若xyz不等于0,且{4x-5y+2z=0,x+4y-3z=0,求x:y:z 数学题用2元1次解已知道4X-3Y-6Z=0 X+2Y-7Z=0且XYZ都不等于0,求X+2Y+3Z分之3X+2Y+Z的