1. 8+5 = ? 15-2 = ? 2. 18-(10-8) = ? 3. 36+27 = ? 4. 9-6 = ?

Решение:

1. \( 8 + 5 = 13 \)
   \( 15 - 2 = 13 \)
2. \( 18 - (10 - 8) = 18 - 2 = 16 \)
3. \( 36 + 27 = 63 \)
4. \( 9 - 6 = 3 \)

Ответ: 1. 13; 13. 2. 16. 3. 63. 4. 3.