(1/(1*2))+(1/(2*3))+(1/(3*4))+…+(1/(2006*2007))=how much.
(1/(1*2))+(1/(2*3))+(1/(3*4))+…+(1/(2006*2007))=多少．
<gadget id="calculator">1 / 2_007</gadget>
<output>1/2_007 = around 0.000498</output>

<gadget id="calculator">1 - (1/2_007)</gadget>
<output>2_006/2_007 = around 0.999502</output>

<result>2_006/2_007 = around 0.999502</result>