2. Есепте.

Решение:

1. \( 2 + 10 = 12 \)
2. \( 10 - 9 = 1 \)
3. \( 9 - 9 = 0 \)
4. \( 20 + 30 = 50 \)
5. \( 100 - 90 = 10 \)
6. \( 40 + 60 = 100 \)
7. \( 14 + 2 = 16 \)
8. \( 15 - 3 = 12 \)
9. \( 18 + 2 = 20 \)

Ответ: 12, 1, 0, 50, 10, 100, 16, 12, 20.