Calculation: (1/2)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)-(1/56)-(1/72)= How many.
计算：(1/2)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)-(1/56)-(1/72)=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / 42</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">1 / 56</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">1 / 72</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">(1/2) - (1/6) - (1/12) - (1/20) - (1/30) - (1/42) - (1/56) - (1/72)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>