Matemática - Aula 21 - Matriz Inversa

http://www.youtube.com/watch?v=SI8e3T7icX8
http://www.youtube.com/watch?v=EFn8guBXqCk
http://www.youtube.com/watch?v=QbwoVGijUBY
http://www.youtube.com/watch?v=WgDzlkTXXCU
http://www.youtube.com/watch?v=owVlYDaUHi4
http://www.youtube.com/watch?v=Iot7K8dUZw8
http://www.youtube.com/watch?v=rph-2sngHBE