(1/(1x2))+(1/(2x3))+(1/(3x4))+(1/(4x5))+...+(1/(99x100)).
(1/(1x2))+(1/(2x3))+(1/(3x4))+(1/(4x5))+…+(1/(99x100))．
<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>