$$\left. \begin{array} { l } { 6 } \\ { 81 x ^ { 3 } - x 8 } \\ { ( 9 x + 1 ) ( 9 x - 1 ) } \end{array} \right.$$
$-6\left(81x^{2}-1\right)\left(81x^{3}-x_{8}\right)$
$$6=2\times 3$$ $$81x^{2}-1=\left(9x-1\right)\left(9x+1\right)$$
$$6\left(-9x-1\right)\left(9x-1\right)\left(81x^{3}-x_{8}\right)$$
$$-39366x^{5}+486x^{3}+486x_{8}x^{2}-6x_{8}$$
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$6,\ 81x^{3}-x_{8},\ 81x^{2}-1$
