Question

Вычислите:...........................................

Answer 1

А)

$({1 frac{3}{8} })^{ - 2} = { (frac{11}{8} })^{ - 2} = { (frac{8}{11} )}^{2} = frac{64}{121}$


ОТВЕТ: 64 / 121


Б)

${8}^{ - frac{2}{3} } = ({ {2}^{3}) }^{ - frac{2}{3} } = {2}^{ - frac{3 times 2}{3} } = {2}^{ - 2} = frac{1}{ {2}^{2} } = \ = frac{1}{4} = 0.25$


ОТВЕТ: 0,25