x^3+y^3+z^3=3xyz,求Zx=?（x的偏导数）

XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值 分式题:xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz) 已知x+y+z=3 xy+yz+zx=3 xyz=1求(x+y) (y+z)(z+x) x^3+y^3+z^3=3xyz,求Zx=?（x的偏导数） XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值求快速啊 若x+y+z=6,xy+yz+zx=11,x^3+y^3+z^3-3xyz 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+zx的值?要过程！！！ 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+zx的值 已知三个数x,y,z满足x+y分之xy=负2,y+z分之yz=3分之4,z+x分之zx=负3分之4,求xy+yz+zx分之xyz的值 已知4x-3y-6z=0,x+2y-7z=0,xyz≠0,求x-y+2z/x+y-zx-y+2z分之x+y-z (x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 xy+yz+zx/x^2+y^2+z^2(x-3y+z)^2+/ 5x-4y+z/=0 且xyz≠0 求：xy+yz+zx/x^2+y^2+z^2 数学题 xy&x+y =-2,yz&y+z=4&3 zx&z+x=-4&3 求XYZ%xy+xz+yz (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=? xy 2yz 3zx 4xyz________ = ________ = _______ = ___________ (xyz不等于0)x+y+xy y+z+yz z+x+zx xy+yz+zx最好有解题思路 算出 X Y Z 分别等于几 已知xyz是3个小于100的正整数,x>y>zx-y,x-z,y-z均是质数,求x-z的最大值 已知实数xyz满足x+y+z=5,xy+yz+zx=3,求z的最大值我知道是13/3, 设实数xyz满足x+y+2z=4 xy+3yz+3zx=7 求z的最大值