(1/2)+((1/3)+(2/3))+((1/4)+(2/4)+(3/4))+…+((1/2005)+… +(2004/2005))=How much.
(1/2)+((1/3)+(2/3))+((1/4)+(2/4)+(3/4))+…+((1/2005)+…+(2004/2005))=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2) * 2_004 * 2_005</gadget>
<output>1_004_505</output>

<result>1_004_505</result>