Addi° soustrac° Entiers

1 ) 1285 + 128 + 13 = ____________________
2 ) 4981 + 929 = ____________________
3 ) 7812 + 388 + 12 = ____________________
4 ) 1987 - 824 = ____________________
5 ) 3502 - 814 = ____________________
6 ) 4912 - 3825 = ____________________