Calculation: (1/(3*5))+(1/(5*7))+(1/(7*9))+…+(1/(2011*2013))+(1/4026).
计算：(1/(3*5))+(1/(5*7))+(1/(7*9))+…+(1/(2011*2013))+(1/4026)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) * (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>