1-(2/3)-(2/9)-(2/27)-(2/81)-(2/243)-(2/729)=how much.
1-(2/3)-(2/9)-(2/27)-(2/81)-(2/243)-(2/729)=多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">2 / 27</gadget>
<output>2/27 = around 0.074074</output>

<gadget id="calculator">2 / 81</gadget>
<output>2/81 = around 0.024691</output>

<gadget id="calculator">2 / 243</gadget>
<output>2/243 = around 0.00823</output>

<gadget id="calculator">2 / 729</gadget>
<output>2/729 = around 0.002743</output>

<gadget id="calculator">1 - (2/3) - (2/9) - (2/27) - (2/81) - (2/243) - (2/729)</gadget>
<output>1/729 = around 0.001372</output>

<result>1/729 = around 0.001372</result>