aplique as propriedades das potências e reduza a uma só potência :
a) (-1/2) 2 . (-1/2) 3
b) [(-4/7)3] 5
c) (3/7) 5 : (3/7) 11
d) (-2/3) 4 . (-2/3) 3 . (-2/3) -2
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