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( √(4/25) )² . ( ∛(5/9) )³ / √ ( 25/81)
( 4/25 ) . ( 5/9 ) / ( √25/√81 )
( 4/5 ) . ( 1/9 ) / ( 5/9 )
( 4/5 ) . ( 1/9 ) . ( 9/5 ) = 4/25 → Solución
b)
( ∛( 1/27) )⁴ / ⁴√ ( 16/81 ) . ∛( - 27/64 )
( ∛1/∛27 )⁴ / ( ⁴√16 / ⁴√81 ) . ∛-27/∛64
( 1 / 3 )⁴ / ( 2 / 3 ) . ( - 3 / 4 )
( 1 / 81 )⁴ / ( - 1 / 2 )
( 1 / 81 ) . ( - 2 ) = - 2 / 81 → Solución