Question

2elevado -3 + 3elevado -2- 1sobre 2 elevado 3

Answer 1

$2^{-3}+3^{-2}-\dfrac{1}{2^3}\\\\\\ =\dfrac{1}{2^3}+\dfrac{1}{3^2}-\dfrac{1}{2^3}\\\\\\ =\dfrac{1}{8}+\dfrac{1}{9}-\dfrac{1}{8}\\\\\\ =\dfrac{1}{9}$


Bons estudos! :-)