Question

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Answer 1

Resposta:

$a) 3^{-2} = \frac{1}{3^{2} } = \frac{1}{9}\\\\b) (\frac{2}{7})^{-1} = \frac{7}{2} \\\\c) (-5)^{-1} = \frac{1}{-5} \\\\d) 10^{-5} = \frac{1}{10^{5} } = \frac{1}{100000} \\\\e) (-\frac{5}{2})^{2} = (-\frac{5^{2} }{2^{2} } )=\frac{25}{2} \\\\f) 20^{-2} = \frac{1}{20^{2} } =\frac{1}{400}$