Ajutatima pls
1+2+3-4+5+6+7-8+...+2009+2010+2011-2012 AJUTATIMA PLS


Răspuns :

1+2+3+...+2010+2011-2012=(2011*2012/2)-2012=(4046132/2)-2012=2023066-2012=

=2021054, (suma calculata cu formula lui Gauss)

[2011 x (2011+1) : 2] - 2012=(2011 x 2012 : 2) - 2012 = 2.023.066 - 2012 = 2.021.054