Factorize:
$a^{3}-0.064$
$a^{3}-0.064=(a)^{3}-(0.4)^{3}$
$=(a-0.4)\left[a^{2}+a \times(0.4)+(0.4)^{2}\right]$
$=(a-0.4)\left(a^{2}+0.4 a+0.16\right)$
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