Ответ:

\(a+28\): \(19+28=47\), \(23+28=51\), \(53+28=81\), \(44+28=72\).

\(52-c\): \(52-25=27\), \(52-44=8\), \(52-17=35\), \(52-39=13\).

Ответ: \(47, 51, 81, 72; 27, 8, 35, 13\).