2^x=5^y=10^z(xyz不等于0)求证xy=yz+xz
2^x=5^y=10^z(xyz不等于0)求证xy=yz+xz
x/3=y/4=z/5,xyz不等于0,则(xy-2yz+xz)/(2x^-y^+z^)的值为
请说明:若X^2 + 2Y^2 + Z^2=XY-YZ-XZ,且XYZ不等于0,则X=Y=-Z
已知2的x次方=5的y次方=10的z次方(x,y,z不等于零),求证:xy=yz=xz
2的x次方=5的y次方=10的z次方(x,y,z不等于零),求证:xy=yz+xz
实数xyz=1,求证x^2+y^2+z^2+3>=2(xy+xz+yz)
设x,y,z≥0,且x+y+z=1,求证:0≤xy+yz+xz-2xyz≤7/27
已知,xyz=0,求x/(xy+x+1)+y/(yz+y+1)+z/(xz+z+1)值?
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
已知:xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证:x=2abc/(bc+a
已知:xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证:x=2abc/(bc+a
已知x,y,z是实数,且xyz=1,求证x^2+y^2+z^2+3大于等于2(xy+xz+yz)