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Answer 1 · 2016-09-23T13:30:27

$3 x y$

We have: $(15) / ((3) / (x y) + (2) / (y x))$

$= (15) / ((3) / (x y) + (2) / (x y))$

$= (15) / ((3 + 2) / (x y))$

$= (15) / ((5) / (x y))$

$= 15 cdot (x y) / (5)$

$= (15 x y) / (5)$

$= 3 x y$