Question

AJUTOR
7+9+11+.......+2011-6-8-10-.....-2010;

1+2+3-4+5+6+7+8-9+......+2008+20099-2010+2011;

1+2+3-4+5+6+7-8......+2009+2010+2011-2012.

Va dau si in exemplu pentru a rezolva....exemplul l-am facut in clasa cu profa:

7+9+11+____+2011-6-8-10-____-2010
(7-6)+(9-8)+(11-10)+____+(2011-2010)
1+1+1+____+1
2012:2=1006
1006-3=1003
1+1+1+____+1=1003
1003

Answer 1

1+2+3+...2009+2010+2011+2012={2012(2012+1)}/2=(2012x20 13)/2=                    =2 025 078