8.10 $x^{6}-9 x^{3}+8>0$.

Translate the above text into English, keeping the original text's line breaks and format, and output the translation result directly.

8.10 $x^{6}-9 x^{3}+8>0$.
8.10 Hint. Introduce an auxiliary variable $x^{3}=y$.

Answer: $(-\infty, 1) \cup(2, \infty)$.