a fost răspuns

S2=1/40+1/88+1/154+....+1/10098

Răspuns :

Albatranask

Răspuns:

97/1530

Explicație pas cu pas:

1/5*8=(1/3)(1/5-1/8)

1/8*11=(1/3)(1/8-1/11)

1/11*14=(1/3) (1/11-1/14)

....................

1/99*102=(1/3) (1/99-1/102)

imsumand..=(1/3)(1/5-1/102)=(1/3)(97/510)=97/1530

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