Respostas
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a) 7^-2
..= 1/7^2
..= 1/49
b) (5/7)^-2
..= (7/5)^2
..= 49/25
c) (2/3)^-4
..= (3/2)^4
..= 81/16
d) 5^-3
..= (1/5)^3
..= 1/125
e) (2/5)^-3
..= (5/2)^3
..= 125/8
f) (6/3)^-1
..= (3/6)^1
..= 3/6
..= 1/7^2
..= 1/49
b) (5/7)^-2
..= (7/5)^2
..= 49/25
c) (2/3)^-4
..= (3/2)^4
..= 81/16
d) 5^-3
..= (1/5)^3
..= 1/125
e) (2/5)^-3
..= (5/2)^3
..= 125/8
f) (6/3)^-1
..= (3/6)^1
..= 3/6
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