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Să se calculeze suma: 1 + 1/3 + 1/3² + 1/3³ + 1/3⁴ + 1/3⁵​

Răspuns :

1+ 1/3+ 1/9+ 1/27+ 1/81+ 1/243=
=243/243+ 81/243+ 27/243+ 9/243+ 3/243+ 1/243=
=364/243