(1+(1/2))(1-(1/3))(1+(1/4))(1-(1/5))…(1-(1/2005))(1+( 1/2006)) = how much.
(1+(1/2))(1-(1/3))(1+(1/4))(1-(1/5))…(1-(1/2005))(1+(1/2006))=多少．
<gadget id="calculator">2_007 / 2_006</gadget>
<output>2_007/2_006 = around 1.000499</output>

<result>2_007/2_006 = around 1.000499</result>