已知实数x、y、z,满足3x-2y-4z=-9且x+2y-4z=5,试求出x^2＋y^2＋z^2的最小值

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+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 已知三个实数x,y,z满足条件(z-x)^2-4(x-y)(y-z)=0,求证:x,y,z成等差数列 已知实数 x y z 满足x+y-z=0 ,3x-y+2z=0 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) 已知实数x,y,z满足2｜x-y｜+√2y+z+z2-z+1/4=0求x+y+z的值 已知实数x,y,z,满足x+y=4及xy=z^2+4,求x+2y+3z的值求教啊 已知实数x,y,z满足x+y=4及xy=z²+4,求x+2y+3z的值 已知实数x,y,z满足x=6-y,z^2-4z+4=xy-9,求x,y,z的值 已知实数x,y,z满足x=6-y,z^2-4z+4=xy-9,求x,y,z的值. 已知实数x,y,z,满足那么x+y=6,z^2=xy-9,求(x+y)^z 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x²+4y²+根号-z²=2x+4y-2,求x+2y-z的平方 已知实数x,y,z满足：|4x-4y+1| + 1/3根号2y+z +z的平方- z + 1/4 = 0,求(y＋z)乘x平方 的值．：(1)(2)(3)(4) 已知实数x,y,z满足｜4x-4y+1｜+1/3√2y+z+z^2-z+1/4=0.求（y+z)*x^2的值.