Question

В выражении 1/a - 1/b = 1/c выразите c через a и b

Answer 1

1/a - 1/b = 1/c
(b-a)/a*b = 1/c
a*b/ (b-a) = c

Answer 2

( 1/а ) - ( 1/b ) = 1/c
( b - a ) / ab = 1 / c
ab = c( b - a )
c = ab / ( b - a )