Question

alguém poderia me ajudar? essas 2 é para agora 7:30 da manhã




A: (-3/5)³

B: (-5/4) -³​

Answer 1

Explicação passo-a-passo:

a)

$\sf \Big(-\dfrac{3}{5}\Big)^3=\Big(-\dfrac{3}{5}\Big)\cdot\Big(-\dfrac{3}{5}\Big)\cdot\Big(-\dfrac{3}{5}\Big)$

$\sf \Big(-\dfrac{3}{5}\Big)^3=\Big(+\dfrac{9}{25}\Big)\Big(-\dfrac{3}{5}\Big)$

$\sf \Big(-\dfrac{3}{5}\Big)^3=\red{-\dfrac{27}{125}}$

b)

$\sf \Big(-\dfrac{5}{4}\Big)^{-3}=\Big(-\dfrac{4}{5}\Big)^3$

$\sf \Big(-\dfrac{5}{4}\Big)^{-3}=\Big(-\dfrac{4}{5}\Big)\cdot\Big(-\dfrac{4}{5}\Big)\cdot\Big(-\dfrac{4}{5}\Big)$

$\sf \Big(-\dfrac{5}{4}\Big)^{-3}=\Big(+\dfrac{16}{25}\Big)\Big(-\dfrac{4}{5}\Big)$

$\sf \Big(-\dfrac{5}{4}\Big)^{-3}=\red{-\dfrac{64}{125}}$