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Sume Gauss : a) 1+2+3+...+201

Răspuns :

2-1=1(diferenta)
(201-1):1+1
200+1(fiindca orice numar inmultit cu unu este egal numarul respectiv)=
=201
S=
(201+1)*201:2
202*201:2
40602:2
=20301
[tex]\displaystyle 1+2+3+...+201= \frac{201(201+1)}{2} = \frac{201 \times 202}{2} = \frac{40602}{2} =20301[/tex]