Calculation: (1/(1+2))+(1/(1+2+3))+(1/(1+2+3+4))+…+(1/(1+2+3+ ...+2015)).
计算：(1/(1+2))+(1/(1+2+3))+(1/(1+2+3+4))+…+(1/(1+2+3+…+2015))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 2_016</gadget>
<output>1/2_016 = around 0.000496</output>

<gadget id="calculator">(1/2) - (1/2_016)</gadget>
<output>1_007/2_016 = around 0.499504</output>

<gadget id="calculator">2 * (1_007/2_016)</gadget>
<output>1_007/1_008 = around 0.999008</output>

<result>1_007/1_008 = around 0.999008</result>