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1+2+3+...+2012 suma lui gauss

Răspuns :

1+2+3+......2012=2012×(2012+1):2=

=2012×2013:2=

=4.050.156:2=2.025.078

formula n×(n+1):2

1+ 2 + 3 +...+ 2012 = ...?

★ Metoda Gauss:

2012•2013:2 = 4050156

4050156:2 = 2025078

1 + 2 + 3 +...+ 2012 = 2025078