Question

1- Calcule : A) 7 elevado a menos 2, B ) (5/7) elevado a menos 2 , C) (2/3) elevado a menos 4 , D ) 5-elevado a 3 e ) (2/5) elevado a menos 3

Answer 1

Resposta:

Explicação passo-a-passo:

$a)7^{-2}=\frac{1}{7^2}=\frac{1}{49}\\\\b)(\frac{5}{7})^{-2}=(\frac{7}{5})^2=\frac{49}{25}\\\\c)(\frac{2}{3})^{-4}=(\frac{3}{2})^4=\frac{81}{16}\\\\d)5^{-3}=\frac{1}{5^3}=\frac{1}{125}\\\\e)(\frac{2}{5})^{-3}=(\frac{5}{2})^3=\frac{125}{8}$