Answer
$y^{2}+y$
Work Step by Step
$y^{1/3}(y^{2/3}+y^{5/3})=y^{1/3}y^{2/3}+y^{1/3}y^{5/3}=y^{1/3+2/3}+y^{1/3+5/3}=y^{2}+y$
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