13. 1) 80-27, 10+34, 50-16, 100-23, 100-98, 8-8, 7-0

Решение:

1. \( 80 - 27 = 53 \)
2. \( 10 + 34 = 44 \)
3. \( 50 - 16 = 34 \)
4. \( 100 - 23 = 77 \)
5. \( 100 - 98 = 2 \)
6. \( 8 - 8 = 0 \)
7. \( 7 - 0 = 7 \)

Ответ: 53, 44, 34, 77, 2, 0, 7.