化简2y-3z/2yz+2z-3x/3zx+9x-4y/6xy
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求证:(x^3/x+y)+(y^3/y+z)+(z^3/z+x)大于等于(xy+yz+zx)/2
若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z)
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>0,y>0,z>0,证明x^3/(x+y)+y^3/(y+z)+z^3/(z+x)≥(xy+xz+yz)/2
已知x,y,z∈(0,+∞)求证:√x^+xy+y^+√y^+yz+z^+√z^+zx+x^>=3/2(x+y+z )
f(x,y,z)=yz+xz使得,y^2+z^2=1,yz=3,求f最大值
化简x^2-yz/[x^2-(y+z)x+yz]+y^2-zx/[y^2-(z+x)y+zx]+z^2-xy/[z^2-(x+y)z+xy]
(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=?
若|x-3|+|y+z|+|2z+1|=0,求XY-YZ的值
若|x-3|+|y+z|+|2z+1|=0,求xy-yz的值
化简2y-3z/2yz+2z-3x/3zx+9x-4y/6xy
已知2/x=3/y=4/z求4x^2+2yz+z^2/x+y+z*x-y-z/8x^2+4yz+2z^2的值
已知2/x=3/y=4/z,求4x^2+2yz+z^2/x+y+z*x-z-y/8x^2+4yz+2z^2的值
以知1/x=3/y=5/z,求4x^2+2yz+z^2/x+y-z*x-z-y/8x^2+4yz+2z^2的值.
已知2/x=3/y=4/z,求4x²+2yz+z²/x+y+z×x-y-z/8x²+4yz+2z²的值.
2/x=3/y=4/z 求4x^+2yz+z^/x+y-z 乘以 x-z-y/8x^+4yz+2z^要答案结果
因式分解 (x+y+z)^2+yz(y+z)+xyz