已知x2 + y2 + z2 = xy + xz + yz = 3 求x+y+z
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已知:x/2=y/3=z/4,求(x2+y2-z2-2xy)/(x2-y2+z2-2xz)除以(x2-y2-z2+2yz)/(x2+y2-z2+2xy)
已知:x/2=y/3=z/4,求(x2+y2-z2-2xy)/(x2-y2+z2-2xz)除以(x2-y2-z2+2yz)/(x2+y2-z2+2xy)
已知x2+y2+z2-xy-yz-xz=0,求证x=y=z
已知:x2+y2+z2=xy+yz+zx,求证:x=y=z.
已知,x/2=y/3=z/4,求xy+yz+zx/x2+y2+z2?????
已知x2 + y2 + z2 = xy + xz + yz = 3 求x+y+z
x2+y2+z2-2xy+2yz+2zx=?
x,y,z为正实数 求证 x2/(y2+z2+yz)+y2/(z2+x2+zx)+z2/(x2+y2+xy)>=1
x2-2xy+y2-z2因式分解
化简(X2+y2-z2-2xy)/(x2-y2+z2-2xy)/(x2-y2-z2+2xy)(x2+y2-z2+2xy)
证明曲面xy=z2与x2+y2+z2=9正交
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已知x-y=5,y-z=3,求x2+y2+z2-xy-yz-xz的值
已知2/x=3/y=4/z,求x2+y2+z2/xy+yz+zx的值.
已知x+y-x=a,xy-xz-yz=b,求x2+y2+z2的值
已知:x/2=y/3=z/4,求xy+2yz-3xz/x2+y2+z2的值