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

<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">(1/2) - (1/11)</gadget>
<output>9/22 = around 0.409091</output>

<gadget id="calculator">2 * (9/22)</gadget>
<output>9/11 = around 0.818182</output>

<result>9/11 = around 0.818182</result>