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+zx=3,则z的取值范围为 ______.
1.已知X,Y,Z为实数,且X+Y+Z=5,XY+YZ+ZX=3,则Z得取值范围为?
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x、y、z为实数,且x+y+z=5,xy+yz+xz=3,求z的取值范围.
已知x,y,z为实数,且x+y+z=5,xy+yz+zx=3,试求z的最大值与最小值
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
若实数x,y,z满足x^2+y^2+z^2=1且x+y+z=0,则实数xy+yz+zx的取值范围是
设xyz是实数,若xy+yz+zx=1,则x+y+z的取值范围是
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