Calculation: (1/2)*(1+(1/3)+(1/6)+(1/10)+(1/15)+(1/21)).
计算：(1/2)*(1+(1/3)+(1/6)+(1/10)+(1/15)+(1/21))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 21</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">1 + (1/3) + (1/6) + (1/10) + (1/15) + (1/21)</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">(1/2) * (12/7)</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>