Exercício 6. Determine quais das matrizes a seguir estão em forma escalonada reduzida.

(a)

⎛⎝1 0 0 0 3
0 0 1 0 −4
0 0 0 1 2
⎞⎠

(b)

⎛⎝1 0 0 1 4
0 1 1 0 −4
0 0 0 1 0
⎞⎠

(c)

⎛⎜⎜⎝
1 0 0 0 3
0 0 1 0 2
0 1 0 0 −1
0 0 0 0 0
⎞⎟⎟⎠

(d)

⎛⎜⎜⎝
1 0 0 0 3
0 1 2 0 2
0 0 0 1 −1
0 0 0 0 0
⎞⎟⎟⎠

(e)

⎛⎝1 0 0 0 4
0 1 1 0 −4
0 0 0 1 0
⎞⎠

(f)

⎛⎝1 0 0 1 4
0 1 0 0 −4
0 0 2 1 0
⎞⎠