X+Y+Z=5,XY+XZ+YZ=3求Z范围
X+Y+Z=5,XY+XZ+YZ=3求Z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.
已知实数x y z 满足x+y+z=5,xy+yz+xz=3求z的取值范围
若实数x,y,z满足x+y+z=5,xy+yz+xz=3,求z的最大值
x+y+z=5,xy+xz+yz=1 ,求Z的最小值和最大值
知x/3=y/4=z/5,求(xy+yz+xz)/xx+yy+zz
x/3=y/2=z/5,求xy+yz+xz/x²+y²+z²
x+y+z=5,xy+yz+xz=3,z的最大值是多少
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+XZ的值
xy/x+y=6/5 yz/y+z=12/7 xz/x+z=4/3 求x和y和z
x+3y+7z=0 2x+5y+11z=0,求(x^2+y^2+z^2)/(xy+2yz+3xz)
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz