Question

please can anyone aanswer this fast ​

Answer 1

$( { \frac{1}{ {4}^{ - 1} } + \frac{1}{ {3}^{ - 1} } })^{ - 1} \\ \\ = ( {4 + 3})^{ - 1} \\ \\ = {7}^{ - 1} \\ \\ = \frac{1}{7}$