已知x,y,z均为实数,a>0,且满足x+y+z=a,x^2+y^2+y^2=1/2a^2,求x,y,z的取值范围已知x,y,z均为实数,a>0,且满足x+y+z=a,x^2+y^2+y^2=1/2×a^2,求x,y,z的取值范围

已知x,y,z均为实数,a>0,且满足x+y+z=a,x^2+y^2+y^2=1/2a^2,求x,y,z的取值范围已知x,y,z均为实数,a>0,且满足x+y+z=a,x^2+y^2+y^2=1/2×a^2,求x,y,z的取值范围 x+y+z=a,x^2+y^2+z^2=1/2a^2,求x,y,z取值范围已知x,y,z均为实数,a>0,且满足x+y+z=a,x^2+y^2+z^2=1/2 a^2,求x,y,z的取值范围. 已知x,y,z均为实数,且满足:x+2y-z=6,x-y+2z=3.求x+y+z的最小值 已知x.y.z均为实数且满足x+y+z=4.求xy+yz+xz的最大值. 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x,y,z为非零实数,且满足x+y-z/z=y+z-x/x=z+x-y/y 求x+y+z/z的值 已知x,y,z均为实数,x>0,y>0,且a=(y-z)²/x—(z-x)²/y,b=x-y,下列结论中必定成立A.若x 已知实数X,Y,Z,满足X^2-2X+Y=Z-1,且X+Y^2+1=0,试比较X,Y,Z的大小. 已知x,y,z为实数,且满足x+2y-5z-3=0;x-2y-z+5=0,则x+y+z的最小值为多少? 若a,b,c均为正数,且都不等于1,若实数x,y,z满足a^x=b^y=c^z,(1/x)+(1/y)+(1/z)=0,则abc等于 已知x,y,z为正实数,满足x-y+2z=0,求y²/(xz)的最小值 已知x,y,z均不为0,且满足方程组x+y-z=0,2x-y-5z=0试求2x+y+3z/3x-y-z 已知x,y,z均不为0,且满足方程组{x+y-z=0,①2x-y-5z=0.②试求(2x+y+3z)/(3x-y-z)值. 已知实数x,y,z满足x^2+4y^2+9z^2=a(a>0) 且x+y+z的最大值是7,求a的值 已知x,y满足不等式x-y≤0 x+y≤4 x≥a且y=2x-y的最大值与最小值大3求实数a的值应该是Z=2x-y 已知x,y,z均不为0,且满足方程组x+y-z=0,①2x-y-5y=0.②试求2x+y+3z/3x-y-z值. 已知实数x,y,z均为正数,且满足3的X幂＝4的Y幂＝6的Z幂,比较3X,4Y,6Z的大小? 已知x,y,z均为非负数,且满足x+y+z=30,3x+y-z=50,求a=5x+4y+2z的最大值和最小值.