Răspuns :
1+2+3+4+5+.....+2013=
=[2013•(2013+1)]:2=
=(2013•2014):2=
=4.054.182:2=
=2.027.091
• = ori ( inmultit => × )
=[2013•(2013+1)]:2=
=(2013•2014):2=
=4.054.182:2=
=2.027.091
• = ori ( inmultit => × )