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

已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数xyz满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3求x+y+z的值 已知实数x,y,z满足关系式2x-3y-z=0,x-2y+z=0,求x比y比z的值 已知实数 x y z 满足x+y-z=0 ,3x-y+2z=0 则x :y :z 已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1+2根号z-1求X+2Y+3Z 已知,实数x,y,z满足x+y+z=0,xy+yz+zx=-3,求z的最大值 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 已知实数x,y,z满足x+y+z=1,x^2+y^2+z^2=1/2求X,Y,Z∈{0,2/3},已知实数x,y,z满足x+y+z=1,x^2+y^2+z^2=1/2求证X,Y,Z∈{0,2/3}, 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=?我很着急 已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值 已知实数x.y.z满足x+y=5及z的2次方=xy+y-9则x+2y+3z=? 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=? 已知实数x、y、z满足x＋y=5,z的平方=xy+y-9,那么x+2y+3z=( ) 已知实数x,y,z满足x-y=5,z^2=-xy-y-9,求x-2y+3z的值 已知实数x,y,z满足：x/（x+1）=y/（y+2）=z/（z+3）=（x+y+z）/3,则x+y+z= 已知实数x,y,z满足：x/（x+1）=y/（y+2）=z/（z+3）=（x+y+z）/3,则x+y+z= 已知非负实数x,y,z满足x+y+z=3 (2),求证x^2/(1+x^4)+y^2/(1+y^4)+z^2/(1+z^4)≤1/(1+x)+1/(1+y)+1/(1+z)