((2004+2003*2005)/(2004*2005-1)).
((2004+2003*2005)/(2004*2005-1))．
<gadget id="calculator">2_003 * 2_005</gadget>
<output>4_016_015</output>

<gadget id="calculator">2_004 + 4_016_015</gadget>
<output>4_018_019</output>

<gadget id="calculator">2_004 * 2_005</gadget>
<output>4_018_020</output>

<gadget id="calculator">4_018_020 - 1</gadget>
<output>4_018_019</output>

<gadget id="calculator">4_018_019 / 4_018_019</gadget>
<output>1</output>

<result>1</result>