已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
已知x/3=y/4=z/6,求(xy+yz+xz)/(x²+y²+z²)
已知x/3=y分/4=z/5≠0求(3x²+4y²+5z²)/(xy+xz+yz)的值,
1.已知3x-4y-z=0,2x+y-8z=0.求x²+y²+z²/xy+yz+2xz 的
x/3=y/2=z/5,求xy+yz+xz/x²+y²+z²
已知2x-3y-z=0,x+3y-14z=0,且x,y,z不为0.求4x的二次幂-5xy+z的二次幂/xy+yz+xz的
已知2x-3y-z=0.x+3y-14z=0,x,y,z不全为0.求xy+yz+xz分之 4x的平方-(5xy+z)的平
已知x/3=y/4=z/6,(x,y,z≠0),求xy+yz+xz/x²+y²+z²
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
已知4x-3y-3z=0,x-3y-z=0 求xy+2yz/x²+y²+z²
已知3x-4y-z=0 2x+y-8z =0,求(x²+y²-z²)/(xy+yz)的值
已知2x-3y-z=0,x=3y-14z=0,且x、y、z不全为0.求(4x2-5xy+z2)÷(xy+yz+xz)的值