解方程组x²+xy+y²=7,y²+yz+z²=19,z²+xz+x&
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/3=y/4=z/6,求(xy+yz+xz)/(x²+y²+z²)
x/3=y/2=z/5,求xy+yz+xz/x²+y²+z²
解方程组 {xy\X+Y=12\7 ,YZ\Y+Z=6\5 ,XZ\X+Z=4\3
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
正整数x、y、z满足x&3-y&3-z&3=3xyz,x²=0(y+z),则xy+yz+xz=()
求方程组的正整数解:x√(yz)+y√(xz)=39-xy y√(xz)+z√(xy)=52-yz z√(xy)+x√(
已知x+y+z=5,且xy+xz+yz=7,求x²+y²+z²的值
解x(x+y+z)=4-yz、y(x+y+z)=9-xz、z(x+y+z)=25-xy方程组
解方程组,xy/x+y=4/5 yz/y+z=20/9 xz/z+x=5/6
解方程组:xy/(x+y)=1/27,yz/(y+z)=1/33,xz/(x+z)=1/30