∛2 (∛2²+∛2+1) ∛2 *(∛2²+∛2+1) ∛2 * (∛2²+∛2+1)
-------- * ------------------ = ------------------------ = ----------------------- =∛2 * (∛2²+∛2+1) =
∛2-1 ((∛2)²+∛2+1²) ( ∛2)³-1³ 2-1
=∛2²+∛2+2
6 (∛5+1) 6*(∛5+1) 6(∛5+1)
---------------- * -------------- = --------------- = ------------- = ∛5+1
(∛25-∛5+1) (∛5+1) (∛5)³+1³ 5+1