Find the sum of the reciprocals of 1*2, 2*3, 3*4, ..., 99*100.
求1*2，2*3，3*4，…，99*100的倒数的和．
<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>