Question

entre as alternativas não possui o meu resultado, aonde eu errei?​

Answer 1

$(\frac{a+b}{a-b} - \frac{a-b}{a+b} ). \frac{a+b}{2ab} \\\\(\frac{a^2+2ab+b^2)}{(a-b).(a+b)} -\frac{(a^2-2ab+b^2)}{(a-b).(a+b)} ). \frac{a+b}{2ab} \\\\(\frac{a^2+2ab+b^2)}{(a-b).(a+b)} - \frac{a^2+2ab-b^2)}{(a-b).(a+b)} ). \frac{a+b}{2ab} \\\\(\frac{2ab+2ab}{(a-b)}).\frac{1}{2ab} \\\\(\frac{4ab}{(a-b)}).\frac{1}{2ab} \\\\\frac{2}{a-b}$

alternativa b