a) \(732:12-246:6+19\)
\(=366:6-246:6+19\)
\(=366.\dfrac{1}{6}-246.\dfrac{1}{6}+19\)
\(=\dfrac{1}{6}\left(366-246\right)+19\)
\(=\dfrac{1}{6}.120+19\)
\(=20+19=39\)
b) \(546:26-156:13\)
\(=273:13-156:13\)
\(=273.\dfrac{1}{13}-156.\dfrac{1}{13}\)
\(=\dfrac{1}{3}\left(273-156\right)\)
\(=\dfrac{1}{3}.117=39\)