Resposta:

Explicação passo a passo:

a)

 -8.A

-8.(-3) -8.18 -8.7

-8.21 -8.(-8) -8.4

-8.9 -8.6 -8.(-13)

[24 -144 -56]

[-168 64 -32]

[-72 -48 104]

______________

b)

6.B

6.0 6.9 6.(-7)

6.5 6.(-14) 6.3

6.(-8) 6.4 6.17

[0 54 -42 ]

[30 -84 18]

[-48 24 102]

c)

1/6 . A"

1/6.(-3) 1/6.18 1/6.7

1/6.21 1/6.(-8) 1/16.4

1/6.9 1/6.6 1/6.(-13)

[-1/2 3 7/6]

[7/2 -4/3 1/4]

[3/2 1 -13/6]