Tính :
$a)$ $\left( {{c^{\frac{2}{3}}} + 1} \right)\left( {{c^{\frac{4}{9}}} + {c^{\frac{2}{9}}} + 1} \right)\left( {{c^{\frac{2}{9}}} - 1} \right)$
$b)$ $\left( {{a^{\frac{1}{6}}} + {b^{\frac{1}{6}}}} \right)\left(
{{a^{\frac{1}{2}}} - {b^{\frac{1}{2}}}} \right)\left( {{a^{\frac{1}{2}}} - {a^{\frac{1}{6}}}{b^{\frac{1}{6}}} + {b^{\frac{1}{3}}}} \right)$
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