Calculation: (2/(1*2*3))+(2/(2*3*4))+(2/(3*4*5))+…+(2/(98*99*100) ).
计算：(2/(1*2*3))+(2/(2*3*4))+(2/(3*4*5))+…+(2/(98*99*100))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 9_900</gadget>
<output>1/9_900 = around 0.000101</output>

<gadget id="calculator">(1/2) - (1/9_900)</gadget>
<output>4_949/9_900 = around 0.499899</output>

<result>4_949/9_900 = around 0.499899</result>