已知实数xyz满足x^2+4y^2+9z^2=a(a>0),且x+y+z的最大值是1,求a的值急

已知有实数x,y,z满足x^2+4y^2+z^2-2x-12y+4z+14=0,求xyz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 若实数x,y,z满足条件√x+√y-1+√z-2=1/4(x+y+z+9),求xyz的值 已知实数xyz满足x+y=5 z的平方=xy+y-9那么x+2y+3z=多少 已知实数xyz满足x+y=5 z的平方=xy+y-9那么x+2y+3z=多少 已知x+1/y=y+1/z=1(2)如果实数xyz满足x+1/y=4,y+1/z=1,z+1/x=7/3,求xyz的值 已知实数xyz满足4x^2/1+4x^2=y,4y^2/1+4y^2=z,4z^2/1+4z^2=x,求xyz的值为什么 已知正实数xyz满足3的x次方=4的y次方=6的z次方,求证:1/z-1/x=1/2y 已知实数xyz满足|x-2y|+2√(2y+z)+z-2z+1=0,求x+y+z的值 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里 实数xyz满足y+z=6-4x+3x^2,z-y=4-4x+x^2,比较xyz的大小 若实数x,y满足根号x+根号y-1+根号z-2=4分之1(x+y+z+9),求xyz的值 有实数x,y,z；已知x+y+z=2,xyz=4；求Z的取值区间 已知实数x,y,z满足:xyz不等于0,2x+3y-13z=0,x-2y+4z=0,求(x^2+y^2-z^2)/(xy-yz+zx)已知实数x,y,z满足:xyz≠0,2x+3y-13z=0,x-2y+4z=0,求(x^2+y^2-z^2)/(xy-yz+zx）的值.在线等 已知xyz为实数,且满足x+y=6,z^2=xy-9,z=()A.+1或-1B.0C.1D.-1 已知实数xyz满足x/y+z+y/z+x+z/x+y=1求x^2/y+z+y^2/z+x+z^2/x+y的值 纠正下！：已知实数xyz满足（x/y+z）+（y/z+x）+（z/x+y）=1求（x^2/y+z）+（y^2/z+x）+（z^2/x+y）的值 已知实数xyz满足:x+y=6,z2=xy-9,则z= 已知实数x,y,x满足x+y+z=7,x^2+y^2+z^2=17.求xyz最大值