Question

calcule as potencias:

a) ( -3 ) -³

b) (-5/7) -³

Answer 1

a)

${( - 3)}^{- 3} = { - 3}^{ - 3}$

$- \frac{1}{ {3}^{3} } = - \frac{1}{27}$

b)

$( { - \frac{5}{7} })^{ - 3} = ( { - \frac{7}{5}) }^{3}$

$- \frac{ {7}^{3} }{ {5}^{3} } = - \frac{343}{125}$

Answer 2

Resposta:

a)(-3)-³=1/(-3)³→1/-9

b)(-5/7)-3=1/(-5/7)3→1/-125/343→-343/125.