已知x/3=y/4=z/6,求(xy+yz+xz)/(x²+y²+z²)
已知x/3=y/4=z/6,求(xy+yz+xz)/(x²+y²+z²)
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
已知x+y+z=10,xy+xz+yz=8,求x²+y²+z²的值
已知x:y:z=3:4:6,求xy+yz+xz / x^+y^+z^ 的值?
已知x/3=y分/4=z/5≠0求(3x²+4y²+5z²)/(xy+xz+yz)的值,
x/3=y/2=z/5,求xy+yz+xz/x²+y²+z²
已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²
已知x-y=1/2+√3,y-z=1/2-√3,求x²+y²+z²-xy-xz-yz的值
已知;x/3=y/4=z/6 求;(xy+yz+xz)/(X2+y2+z2)
已知x:y:z=1:2:3,xy+yz+xz=66,求2x²+12y²-9z²的值.
已知X/3=Y/4=Z/6,求(XY+YZ+XZ)/(X^2+Y^2+Z^2)的值