((2005+2006*2004)/(2005*2006-1)).
((2005+2006*2004)/(2005*2006-1))．
<gadget id="calculator">2_006 * 2_004</gadget>
<output>4_020_024</output>

<gadget id="calculator">2_005 + 4_020_024</gadget>
<output>4_022_029</output>

<gadget id="calculator">2_005 * 2_006</gadget>
<output>4_022_030</output>

<gadget id="calculator">4_022_030 - 1</gadget>
<output>4_022_029</output>

<gadget id="calculator">4_022_029 / 4_022_029</gadget>
<output>1</output>

<result>1</result>