Calculation: 1-(5/6)+(7/12)-(9/20)+(11/30)-(13/42)+(15/56)-(17/72)=how much.
计算：1-(5/6)+(7/12)-(9/20)+(11/30)-(13/42)+(15/56)-(17/72)=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (1/9)</gadget>
<output>11/18 = around 0.611111</output>

<result>11/18 = around 0.611111</result>