Calculate; (1+(1/2)+…+(1/2007))*((1/2)+…+(1/2008))-(1+(1/2)+…+(1/2007) 2008))*((1/2)+…+(1/2007))=how much.
计算；(1+(1/2)+…+(1/2007))*((1/2)+…+(1/2008))-(1+(1/2)+…+(1/2008))*((1/2)+…+(1/2007))=多少．
<gadget id="calculator">1 / 2_008</gadget>
<output>1/2_008 = around 0.000498</output>

<result>1/2_008 = around 0.000498</result>