Question 406466
{{{ (5/x + 5/y) / (10x+10y)  }}}
= {{{((5x + 5y)/xy)/(10(x+y))}}}
= {{{(5(x + y)/xy)/(10(x+y)/1)}}}
= {{{(5(x+y)/xy)*(1/(10(x+y)))}}}
= {{{1/(2xy)}}}