14+13-(19-15)+(81-17)

Решение:

\( 14 + 13 - (19 - 15) + (81 - 17) \)

1. \( 19 - 15 = 4 \)
2. \( 81 - 17 = 64 \)
3. \( 14 + 13 = 27 \)
4. \( 27 - 4 = 23 \)
5. \( 23 + 64 = 87 \)

Ответ: 87