<PRE><B>Question 164261</B>
  &amp;#8730;x       
---------  
&amp;#8730;x+&amp;#8730;y      
        &amp;#8730;x (&amp;#8730;x-&amp;#8730;y)         
 =   --------------------  
       (&amp;#8730;x+&amp;#8730;y) (&amp;#8730;x-&amp;#8730;y)     
      x-&amp;#8730;xy
=    ---------
       x-y
</PRE>