Question

Efetuando-se 2^-1+2^1 / 2^-1-2^1, obtém-se:

Answer 1

$\frac{\frac{1}{2}+2}{\frac{1}{2}-2}\\ \\\frac{\frac{1}{2}+2}{-\frac{3}{2}}\\ \\\frac{\frac{5}{2}}{-\frac{3}{2}}\\ \\-\frac{5\cdot \:2}{2\cdot \:3}\\ \\\boxed{-\frac{5}{3}}$

Bons estudos!