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8 (x^3 - x^2 + 1/5 - 1/21) Rptta
Si es : 8^3 - 8^2 + 8/5 - 8/21
8x8x8 - 8x8 + 8/5 - 8/21
8 ( 8x8 - 8 + 1/5 - 1/21 )
8 ( 64 - 1 + 1/5 -1/21 )