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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#