Question

Calcule o valor de:a)3-² b)(+2/7)-¹c)(-5)-¹d)10-⁵ e)(-5/2)-² f)20-²

Answer 1

As potências obitidas nas frações foram:

$a) 1/9\\b) 7/2\\c) -1/5\\d) 1/100000\\e) 4/25\\f) 1/400$

Para calcular as potências de expoente negativo, deve-se inverter a base

$a)3^-2\\ (1/3)^2\\ 1/9$

$b)(+2/7)^{-1}\\ 7/2$

$c)(-5)^{-1}\\ (-1/5)^{1}\\ -1/5$

$d)10^{-5}\\ (1/10)^5\\ 1/100000$

$e)(-5/2)^{-2}\\ (-2/5)^2\\ 4/25$

$f)20^{-2}\\ (1/20)^2\\ 1/400$

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