Răspuns:
1. 2486-1957=529
1957+529=2486
2. 4896-1586=3310
1586+3310=4896
3. 3002-1834=1168
1834+1168=3002
4. 7283-4997=2286
4997+2286=7283
5. 5828+2350=8178
8178-2350=5828
6. 2783+3979=6762
6762-3979=2783
7. 7034-5396=1638
1638+5396=7034
8. 5003-1496=3507
3507+1496=5003
9. 2014+2999=5013
5013-2999=2014
10. 6050-3025=3025
3025+3025=6050
11. 4880-2764=2166
2166+2764=4880
12. 8768-5764=3004
3004+5768=8768