Question

Efetue as propriedades das potências de expoente negativo

A)
${21}^ { - 2}$
B)
${3}^{ - 4}$
C)
$\frac{1}{3}^{ - 1}$
D)
$\frac{2}{3} ^{ - 3}$

Answer 1

$a) {21}^{ - 2} = \frac{1}{ {21}^{2} } = \frac{1}{441}$
$b) {3}^{ - 4} = \frac{1}{ {3}^{4} } = \frac{1}{81}$
$c) ({ \frac{1}{3} )}^{ - 1} = \frac{1}{ \frac{1}{3} } = 1 \times 3 = 3$
$d)( { \frac{2}{3} )}^{ - 3} = \frac{1}{ {( \frac{2}{3} )}^{3} } = \frac{1}{ \frac{8}{27} } = 1 \times \frac{27}{8} = \frac{27}{8}$