Question 6If $x,$ $y$ and $2x+\frac y2$ are not zero, then $$ \left(2x+\frac y2\right)^{-1}\left[(2x)^{-1}+\left(\frac y2\right)^{-1}\right] $$ equals$1$$xy^{-1}$$x^{-1}y$$(xy)^{-1}$none of these