a. [00041

00210

0−1122

0−2563

−1−17

−24

]0 [0210

−11

−22

−2563

17

−24

]+0 [0041

−11

−22

−2563

17

−24

]+0[ 0041

0210

−2563

17

−24

]+0[ 0041

0210

−11

−22

17

−24

]−[0041

0210

−11

−22

−2563

]

¿−[0041

0210

−11

−22

−2563

]=−(0[2 1 51 −2 60 2 3]+0 [

0 1 54 −2 61 2 3 ]−[0 2 5

4 1 61 0 3]−2[

0 2 14 1 −21 0 2 ])

−[−(0 (3−(0 ) )−2 (12−6 )+5 (0−1 )) ]−2 (0 (2−0 )−2 (8+2 )+1 (0−1 ) )

−[−2 (6 )+5 (−1 ) ]−2 (0−20+1 (−1 ) )

−[−12−5 ]−2 [−20−1 ]

−[−17 ]−2 [−21 ]=17+42=59