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1+2 la puterea -1 + 2 la puterea -2 + 2 la puterea -3

Răspuns :

Răspuns:

1+2^(-1)+2^(-2)+2^(-3)

1+1/2+1/2^2+1/2^3

1+1/2+1/4+1/8

(8+4+2+1)/8

15/8