x^2+y^2+z^2=2,xy+yz+xz的范围
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x^2+y^2+z^2=2,xy+yz+xz的范围
x^2+y^2+z^2=2,xy+yz+xz的范围
x^2+y^2+z^2=2,xy+yz+xz的范围
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
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)
求证不等式 xyz[yz(y+z)+zx(z+x)+xy(x+y)]>=2(xy+yz+xz)^2
化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz-yz+xy)
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]
若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z)
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
若Y/X=3/2,Y/Z=3/4.则2XY+YZ/2YZ-XY=多少
若Y/X=3/2,Y/Z=3/4.则(2XY+YZ)/(2YZ-XY)=多少
已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z
方程组xy/x+y=2 yz/y+z=4 zx/x+z=5 求x,y,z
设x,y,z∈R+,xy+yz+xz=1,证明不等式:(xy)^2/z+(xz)^2/y+(yz)^2/x+6xyz≥x+y+zRt
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
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
(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=?
|x-3|+|y+2|+|2z+|=0,求(xy-yz)(y-x+2的值