Calculation formula: (((1/1)-(1/3))/((1/1)*(1/2)*(1/3)))+(((1/2)-(1/4 ))/((1/2)*(1/3)*(1/4)))+(((1/3)-(1/5))/((1/3)*(1/4 )*(1/5)))+…+(((1/9)-(1/11))/((1/9)*(1/10)*(1/11))) how many.
算式：(((1/1)-(1/3))/((1/1)*(1/2)*(1/3)))+(((1/2)-(1/4))/((1/2)*(1/3)*(1/4)))+(((1/3)-(1/5))/((1/3)*(1/4)*(1/5)))+…+(((1/9)-(1/11))/((1/9)*(1/10)*(1/11)))的计算结果是多少．
<gadget id="calculator">2 + 10</gadget>
<output>12</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">2 * 12 * (9/2)</gadget>
<output>108</output>

<result>108</result>