Posted By: JayDee (expect the unexpected) on 'CZriddles'
Title:     Re: z maticky olympiady
Date:      Tue Oct  2 18:30:05 2007

> Dokazte ze cislo (4a^2-1)^2 je delitelny cislem 2ab-1 prave tehdy, kdyz a=b.

a=b=2 => (4*4-1)^2 = 15^2 = 3*3*5*5 je toto delitelne 7mi? Ne.

Trivialne neplati. qed

j.d.

> Mena

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