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#### Albert

##### Well-known member

- Jan 25, 2013

- 1,225

x>1,y>1 and z>1

prove :$\dfrac {x^4}{(y-1)^2}+\dfrac {y^4}{(z-1)^2}+\dfrac

{z^4}{(x-1)^2}\geq 48$

prove :$\dfrac {x^4}{(y-1)^2}+\dfrac {y^4}{(z-1)^2}+\dfrac

{z^4}{(x-1)^2}\geq 48$