Ta có: 24 \(\equiv\)5 (mod 19)
\(\Rightarrow\)241917 \(\equiv\)51917 (mod 19)
14 \(\equiv\)-5 (mod 19)
\(\Rightarrow\)141917 \(\equiv\)-51917 (mod 19)
\(\Rightarrow\)241917 + 141917 \(\equiv\)51917 + (-51917) (mod 19)
241917 +141917 \(\equiv\)0 (mod 19)
hay 241917+ 141917 \(⋮\)19 (đpcm)