Calculation: (1/(1*2*3))+(1/(2*3*4))+…+(1/(9*10*11)).
计算：(1/(1*2*3))+(1/(2*3*4))+…+(1/(9*10*11))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">10 * 11</gadget>
<output>110</output>

<gadget id="calculator">1 / 110</gadget>
<output>1/110 = around 0.009091</output>

<gadget id="calculator">(1/2) - (1/110)</gadget>
<output>27/55 = around 0.490909</output>

<gadget id="calculator">(1/2) * (27/55)</gadget>
<output>27/110 = around 0.245455</output>

<result>27/110 = around 0.245455</result>