Calculation: 1/2+1/6+1/12+1/20+...+1/9900.
计算：1/2+1/6+1/12+1/20+…+1/9900．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 - (1/100)</gadget>
<output>99/100 = around 0.99</output>

<result>99/100 = around 0.99</result>