1/2x=1/3y=1/4zx,y,z不等于0求 x：y：z

(x+y-xy)/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y=1/z,则xyz=? 已知（x+y-xy）/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y-1/z,则xyz=? 1/2x=1/3y=1/4zx,y,z不等于0求 x：y：z 已知xy/x+y=3,yz/y+z=2,zx/z+x=1,求y的值 已知,xy/(x+y)=1,zy/(z+y)=2,zx/(x+z)=3,球x=? 已知xy/(x+y)=1,yz/(y+z)=2,zx/(z+x)=3,求x的值 X+Y/XY=1,Y+Z/YZ=2,Z+X/ZX=3 求X的值 xy/x+y=1 yz/y+z=2 zx/z+X=3 求x等于多少 x-3=y-2=z-1,求x²+y²+z²-xy-yz-zx的值. 若x/3=y/1=z/2,且xy+yz+zx=99,求zx平方+9y平方+9z平方的值? (x+y-xy)/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y-1/z,则xyz=?看清楚是2/x=3/y-1/z X+Y+Z=0 4X+2Y+1=-3Z X+4Y=9X+Y+Z=04X+2Y+1=-3ZX+4Y=9这个方程怎么解? 已知xy/(x+y)=1,yz/(y+z)=2,zx/(z+x)=3,求1/x+1/y+1/z的值 y,z满足：xy/x+2y=1,zy/y+2z=2,zx/z+2x=3,则x= 一道数学题,已知x+y+z=1,x^2+y^2+z^2=2,问xy+yz+zx,x^3+y^3+z^3 已知x+y分之xy=1,y+z分之yz=2,z+x分之zx=3,求x+y+z的值 xy/x+y=1,zy/z+y=2,zx/z+x=3,求x,y,z的值, 已知xy:yz:zx=3:2:1,求(x+y):z的值