Answer
$\sqrt[3] {y^{2}z}$
Work Step by Step
$\sqrt[9] {y^{6}z^{3}}=(y^{6}z^{3})^{1/9}=y^{6/9}z^{3/9}=y^{2/3}z^{1/3}=(y^{2}z)^{1/3}=\sqrt[3] {y^{2}z}$
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