实数xyz满足x+y+z=5,xy+xz+zx=3.求Z的取值范围
实数xyz满足x+y+z=5,xy+xz+zx=3.求Z的取值范围
已知实数x,y,z满足x+y+z=5,xy+yz+zx=3.求z的取值范围
已知实数x y z 满足x+y+z=5,xy+yz+xz=3求z的取值范围
已知实数xyz满足x+y+z=5,xy+yz+zx=3,求z的最大值
1.x,y,z为实数,且xy/x+y=1/3,yz/y+z=1/4,xz/x+z=1/5,求xyz/xy+yz+zx的值
x,y,z为实数,且xy/x+y=1/3,yz/y+z=1/4,xz/x+z=1/5,求xyz/xy+yz+zx的值
急!x,y,z为实数,且xy/x+y=1/3,yz/y+z=1/4,xz/x+z=1/5,求xyz/xy+yz+zx的值
设xyz是实数,若xy+yz+zx=1,则x+y+z的取值范围是
XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值
已知x,y,z是实数,且x+y+z=5,xy+yz+zx=3,求z的取值范围
已知x、y、z为实数,且x+y+z=5,xy+yz+xz=3,求z的取值范围.
x.y.z三个数满足xy/x+y=-2.yz/y+z=4/3,zx/z+x=负的4/3求xyz/xy+xz+yz