La expresión $\left [ 5-4\left ( \frac{\left ( \frac{1}{2} \right )^{2}-1}{\frac{1}{2}-1} \right ) \right ]$ es:

 $$\left [ 5-4\left ( \frac{\left ( \frac{1}{2} \right )^{2}-1}{\frac{1}{2}-1} \right ) \right ]$$

$$\left [ 5-4\left ( \frac{\frac{1}{4}-1}{\frac{1-2}{2}} \right ) \right ]$$

$$\left [ 5-4\left ( \frac{\frac{1-4}{4}}{\frac{-1}{2}} \right ) \right ]$$

$$\left [ 5-4\left ( \frac{\frac{-3}{4}}{\frac{-1}{2}} \right ) \right ]$$

$$\left [ 5-4\left ( \frac{-6}{-4} \right ) \right ]$$

$$\left [ 5-4\left ( \frac{3}{2} \right ) \right ]$$

$$\left [ 5-2\left ( 3 \right ) \right ]$$

$$\left [ 5-6 \right ]$$

$$ -1$$