已知3x-y-3z=0,x-6y=6z=0.则有(x+y+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 若{x+3y+10z=0 则 (x+y-z)/(x-y+z) 已知实数x,y,z满足:3x-y-3z=0和x-6y+6z=0(z≠0),则代数式x+y+z/x-y+z的值等于 已知X-3Y+Z=0 3X-3Y-4Z=0.则X:Y:Z=? 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值 已知x^3+y^3-6x+2y+z+3+10=0,求（x-y+z)(x+y-z)的值.（z+3)是绝对值 已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值 已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z 已知3X=4X,5Y=6Z求X+Y：Y+Z