设实数x>0,y>0,z>0,a>0,b>0,且x,y,z满足条件 x^2+y^2-xy=a^2;x^2+z^2-xz=
设正实数x,y,z满足x^2-3xy+4y^2-z=0,则z/xy取得最大值时,x+2y+-z的最大值为 (A)0 (B
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
若实数xyz满足(x-2y+z)^2+4(x-y)(y-z)=0 A xy-yz=0 B xy+yz=0 C xy-xz
已知三个实数x,y,z满足条件(z-x)^2-4(x-y)(y-z)=0,求证:x,y,z成等差数列
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
实数x,y,z满足x=y+根号2,2xy+2*根号2*z*z+1=0,则x+y+z等于多少
设x,y,z≥0,且x+y+z=1,求证:0≤xy+yz+xz-2xyz≤7/27
设x,y,z≥0,且xy+yz+xz=1,求1/x^2+1/y^2+1/z^2的最小值
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y
设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y
x y z 满足等式x/4=y/3=z/2不等于0,求分式x二次方+y二次方/xy-xz的值