\[ 12 + 29 = 41 \]
\[ 81 - 28 = 53 \]
\[ 45 + 15 = 60 \]
\[ 64 - 39 = 25 \]
\[ 23 + 39 = 62 \]
Ответ: 12, 81, 45, 64, 23