Question

$( \frac{1}{x}+ \frac{1}{y})/ \frac{2}{xy}$

Answer 1

$( \frac{1}{x}+ \frac{1}{y})/ \frac{2}{xy}=\frac{y+x}{xy}/ \frac{2}{xy}=\frac{y+x}{xy}*\frac{xy}{2}= \frac{x+y}{2}$