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