Question

alguem me ajudar por favor​

Answer 1

$A=(x-y)/(xy)$

$A=(\frac{2}{5}-\frac{1}{2})/(\frac{2}{5}.\frac{1}{2})$

$A=(\frac{4}{10}-\frac{5}{10})/\frac{2}{10}$

$A=-\frac{1}{10}/\frac{2}{10}$

$A=-\frac{1}{10}.\frac{10}{2}$

$A=-\frac{10}{20}$

$A=-\frac{1}{2}$

$A=-0,5$