Question

With explanation, please

Answer 1

44

Explanation:

(7^-1 - 8^-1)^-1 - (3^-1 - 4^-1)^-1

( 1/7 - 1/8 )^-1 -( 1/3 - 1/4)^-1

( 1/56)^-1 -( 1/12)^-1

56 -12

44