已知xyz不等于0,x+3y+z=0,2x+3y-z=0,则x+2y-7z / 3x+5y+z的值为___?
已知xyz不等于0,x+3y+z=0,2x+3y-z=0,则x+2y-7z / 3x+5y+z的值为___?
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:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz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
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2X+5Y+4Z=0,3X+Y-7Z=0,且XYZ不等于0,求(X+Y+Z)/(2X-3Y+4Z)的值
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{4x-5y 2z=0/x 4y-3x=0(xyz不等于0),求x:y:z:d的值
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值