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Re: [obm-l] Congruência modular
- To: obm-l@xxxxxxxxxxxxxx
- Subject: Re: [obm-l] Congruência modular
- From: "saulo nilson" <saulo.nilson@xxxxxxxxx>
- Date: Sat, 24 Mar 2007 23:21:36 -0300
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^n^2-1=(2t+1)^2-1
=4t^2+4t=4t(t+1)
logo
4=4mod0
t*(t+1)=0mod2
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4t(t+1)=0mod8
On 3/24/07, Bruna Carvalho <bruna.carvalho.pink@gmail.com> wrote:
Se n é ímpar, prove que n²-1 é divisível por 8.
Eu quero aprender como faz esse tipo de questão por congruência, alguém pode me dar uma ajudinha.
bjos.
--
Bjos,
Bruna