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Pls help ans is a+b but idk how to get it

Answer»

Answer:

GIVEN EXPRESSION is

\frac{ {a}^{ - 1} + {b}^{ - 1} }{ {ab}^{ - 1} }

= \frac{ \frac{1}{a} + \frac{1}{b} }{ \frac{1}{ab} }

TAKING lcm in numerator,

= \frac{ \frac{a + b}{ab} }{ \frac{1}{ab} }

= \frac{(a + b)ab}{ab}

= a + b


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