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Calculează 11+13+15+...+2009
Am nevoie urgent


Răspuns :

Răspuns:

1+3+5+...+2009-(1+3+5+...+9)

*1004²-1)-(4²-1)=1004²-4²

Răspuns:

11+13+15+....+2009=?

nr.termeni=(2009-11):2+1=

1998:2+1=

999+1=

1000

Suma=(2009+11)•1000:2=

(2020•1000):2=

2020000:2=

1.010.000

Suma Gauss