Create ac-3.txt

Atividade complementar 3 :  deadline: 05/Out/2014 23:59
simple clarification update

added (ac-3.txt) after this file
Added template ac-4

latex template and pdf version para atividade complementar 4
Update ac-3.txt

Adicionar : Histórico de Alterações
Merge branch 'master' of https://github.com/ra135582/teaching-ea976

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