Known (1/2)=(1/1)-(1/2), (1/6)=(1/2)-(1/3), (1/12)=(1/3)- (1/4),..., calculation: (1/2)+(1/6)+(1/12)+(1/20)+...+(1/9900).
已知(1/2)=(1/1)-(1/2)，(1/6)=(1/2)-(1/3)，(1/12)=(1/3)-(1/4)，…，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>