Cho x,y,z bất kì
CMR:$\dpi{150} \frac{\left | x-y \right |}{\sqrt{1+x^2}.\sqrt{1+y^2}}$+$\dpi{150} \frac{\left | y-z \right |}{\sqrt{1+y^2}.\sqrt{1+z^2}}\geq$$\dpi{150} \frac{\left | z-x \right |}{\sqrt{1+z^2}.\sqrt{1+x^2}}$
Cho x,y,z bất kì
CMR:$\dpi{150} \frac{\left | x-y \right |}{\sqrt{1+x^2}.\sqrt{1+y^2}}$+$\dpi{150} \frac{\left | y-z \right |}{\sqrt{1+y^2}.\sqrt{1+z^2}}\geq$$\dpi{150} \frac{\left | z-x \right |}{\sqrt{1+z^2}.\sqrt{1+x^2}}$
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