Simple calculation: 1/1(1/2)/1(1/3)/1(1/4)/…/1(1/30).
简便计算：1/1(1/2)/1(1/3)/1(1/4)/…/1(1/30)．
<gadget id="calculator">2 / 31</gadget>
<output>2/31 = around 0.064516</output>

<result>2/31 = around 0.064516</result>