xyz>0,x+3y+4z=6.,x^2y^3z最值

已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3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 已知方程组{2X-Y+3Z=0,X-3Y+Z=0(XYZ≠0),求3Y分之4X+2Z的值 已知有理数x,y,z满足(x-z-2)^2+(3x-6y-7)^2+|3y+3z-4|=0求xyz的值 已知xyz满足方程组x+4y-3z=0,求x：y：z的值 4x-5y+2z=0 x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值 x:y:z=2:3:4且x+y+z=18求xyz 已知x+y+z=0,求多项式x^3+x^2z-xyz+y^3的值 已知方程组4x-3y-3z=0 x+3y+z=0(xyz不等于0）,求x/y y/z的值 已知有理数xyz 满足|x-z-2|+（3x-6y-7)的二次方+|3y+3z-4|=0 ,求xyz的值.