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AnnaCheles
a fost răspuns

Sn=1/3 + 1/3 (la puterea a 2) +....+1/3(la puterea 5 ) va rog multtt !!! <3

Răspuns :

Ovdumi
Sn = 1/3 +1/3^2 + 1/3^3 +................1/3^5
1/3 Sn = 1/3^2+1/3^3+1/3^4+...........1/3^5+1/3^6
le scadem
Sn(1-1/3) = 1/3 - 1/3^6   restu s-au redus
Sn = (1/3-1/3^6)/(1-1/3)
Sn=121/243
nu inteleg ce e cu <3

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