Question

(a+b)^-1 (a^-1 + b-2)

Answer 1

$= > {(a + b)}^{ - 1} ( {a}^{ - 1} + {b}^{ - 1} ) \\ \\ \\ = > \frac{1}{a + b} \times \frac{1}{a} + \frac{1}{b} \\ \\ \\ \\ = > \frac{1}{a + b} \times \frac{b + a}{ab} \\ \\ \\ \\ = > \frac{b + a}{(a + b)ab} \\ \\ \\ \\ = > \frac{1}{ab} \\ \\ \\ \\ = > {a}^{ - 1} {b}^{ - 1}$