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a)
\frac{2a^{\frac{1}{3}}}{3}=\frac{2\sqrt[3]{a}}{3}
b)
6a^{\frac{5}{2}}=6\sqrt{a^5}
c)
7a^{-\frac{4}{5}}=\frac{7}{\sqrt[5]{a^4}}
d)
\frac{a^{-\frac{9}{5}}}{4}=\frac{1}{4\sqrt[5]{a^9}}