Calculation; (1/(2*4))+(1/(4*6))+(1/(6*8))+…+(1/(2006*2008)).
计算；(1/(2*4))+(1/(4*6))+(1/(6*8))+…+(1/(2006*2008))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 2_008</gadget>
<output>1/2_008 = around 0.000498</output>

<gadget id="calculator">(1/2) - (1/2_008)</gadget>
<output>1_003/2_008 = around 0.499502</output>

<gadget id="calculator">(1/2) * (1_003/2_008)</gadget>
<output>1_003/4_016 = around 0.249751</output>

<result>1_003/4_016 = around 0.249751</result>