S= 1+ 1/2+ 1/2 la puterea a doua+...+1/2 la puterea 2011
HELPPPP


Răspuns :

S= 1+ 1/2+ 1/2 ^2+...+1/2^2011;  ^e simbol pentru ridicarea la putere

2S=2+1+1/2+1/2^2+......+1/2^2010

2S-S=2-  1/2^2011

S=(2^2012   -1) / 2^2011