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Math Help - Perfect square

  1. #1
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    Perfect square

    Hi,

    x,y \in \mathbb{N} such as: xy / (x^2+y^2-x), how to show that x is a perfect square???
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  2. #2
    Moo
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    Salut,

    Ah bah voil, ici ta question a un peu plus de sens (c'est pas encore tout fait a)... x et y sont tels que xy/(x+y-x) ... quoi ? est un entier ?

    Translation : there is some information missing
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