Respostas

2013-11-05T16:12:58-02:00
Por exemplo, calcular a inversa da matriz...
2...6
4...8

2...6    a...b     1...0
4...8 x c...d =   0...1

2a+6c = 1 
4a+8c = 0 :(-2)

2a+6c = 1
-2a-4c = 0
----------------
2c = 1 --> c = 1/2
4a+8c = 0
4a+8.1/2 = 0
4a+4 = 0
4a = -4
a = -1

2b+6d = 0
4b+8d = 1 :(-2)

2b+6d = 0
-2b-4d = -2
------------
2d = -2
d = -2/2
d = -1
2b+6.(-1) = 0
2b - 6 = 0
2b = 6
b = 6/2
b = 3

A^-1 = 
-1....3
1/2...-1