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(5/3)^k = 27/125
(3/5)^k-1 = (3/5)^3
corta as bases (3/5)
k-1=3
k=3+1
k=4
(3/5)^k-1 = (3/5)^3
corta as bases (3/5)
k-1=3
k=3+1
k=4
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