5yz/(y+z)=6,4xy/(z+x)=3,3xy/x+y=2
5yz/(y+z)=6,4xy/(z+x)=3,3xy/x+y=2
已知三个数x,y,z,满足xy/x+y=-2,yz/y+z=4/3,zx/z+x=-4/3,求(xyz)/(xy+yz+
解方程组 {xy\X+Y=12\7 ,YZ\Y+Z=6\5 ,XZ\X+Z=4\3
xy/x+y=6/5 yz/y+z=12/7 xz/x+z=4/3 求x和y和z
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
(x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2
已知2X-3Y-Z=0,X+3Y-14Z=0,X,Y,Z不全为0,求【4X的平方-5XY+Z的平方】除以【XY+YZ+Z
XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值
若实数x,y,z满足x+y+z=5,xy+yz+xz=3,求z的最大值
时数x,y,z满足x+y+z=5,xy+yz+zx=3,求Z最大值
若3/x=2/y=5/z则xy+yz+zx/x^2+y^2+z^2=?
解方程组{xy/x+y=4 yz/y+z=6 zx/z+x=3,