Заполните цепочку и найдите х.

Решение:

1. \( x + 5 = 60 \) → \( x = 60 - 5 \) → \( x = 55 \)
2. \( x + 2 = 20 \) → \( x = 20 - 2 \) → \( x = 18 \)
3. \( x + 8 = 8 \) → \( x = 8 - 8 \) → \( x = 0 \)
4. \( x + 3 = 12 \) → \( x = 12 - 3 \) → \( x = 9 \)
5. \( x + 9 = 11 \) → \( x = 11 - 9 \) → \( x = 2 \)

Ответ: 1) x = 55; 2) x = 18; 3) x = 0; 4) x = 9; 5) x = 2.