Calculate with a simple algorithm: (1/3)+(1/9)+(1/27)+(1/81)+(1/243)+(1/729).
用简便算法计算：(1/3)+(1/9)+(1/27)+(1/81)+(1/243)+(1/729)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 27</gadget>
<output>1/27 = around 0.037037</output>

<gadget id="calculator">1 / 81</gadget>
<output>1/81 = around 0.012346</output>

<gadget id="calculator">1 / 243</gadget>
<output>1/243 = around 0.004115</output>

<gadget id="calculator">1 / 729</gadget>
<output>1/729 = around 0.001372</output>

<gadget id="calculator">(1/3) + (1/9) + (1/27) + (1/81) + (1/243) + (1/729)</gadget>
<output>364/729 = around 0.499314</output>

<result>364/729 = around 0.499314</result>