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= -2/3 + [(-1/3)^6 + (-1/3)³] : 1/3 =
= -2/3 + [1/729 + (-1/27)] : 1/3 = -2/3 + (1/729 - 27/729) * 3 =
= -2/3 + (-26/729) * 3 = -2/3 + (-16/243) = -162/243 - 16/243 =
= -178/243
liczba odwrotna do tej to
-243/178 =
liczba odwrotna: