化简-[(4^-2)(xy^-1)(z/-3)]^2/[(-2x)^2(yz)^4]^-2

化简-[(4^-2)(xy^-1)(z/-3)]^2/[(-2x)^2(yz)^4]^-2 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+ (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) 5yz/(y+z)=6,4xy/(z+x)=3,3xy/x+y=2 XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值 证明 (x+y+z)^2>3(xy+yz+zx) 若｜x-3｜+｜y+z｜+｜2z+1｜=0,求xy-yz的值 若x/2=1/y=z/3,且xy+xz+yz=99,求4x^2-2xz+3yz-9y^2的值. 已知x /2=y/3=z/4,求代数式x-2y+3z/xy+2yz+3yz的值 已知xy：yz：zx=3：2：1,求①x:y:z ②x/yz:y/zx x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz 化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz