ab is the reciprocal of each other, then (1/2011)ab=how much.
ab互为倒数，则(1/2011)ab=多少．
<gadget id="calculator">1 / 2_011</gadget>
<output>1/2_011 = around 0.000497</output>

<result>1/2_011 = around 0.000497</result>