Calculation: (9/20)-(11/30)+(13/42)-(15/56)+(17/72)-(19/90)+(21/110)-(23/132)+ (25/156)-(27/182).
计算：(9/20)-(11/30)+(13/42)-(15/56)+(17/72)-(19/90)+(21/110)-(23/132)+(25/156)-(27/182)．
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">11 / 30</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">(9/20) - (11/30)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">13 / 42</gadget>
<output>13/42 = around 0.309524</output>

<gadget id="calculator">15 / 56</gadget>
<output>15/56 = around 0.267857</output>

<gadget id="calculator">(13/42) - (15/56)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">17 / 72</gadget>
<output>17/72 = around 0.236111</output>

<gadget id="calculator">19 / 90</gadget>
<output>19/90 = around 0.211111</output>

<gadget id="calculator">(17/72) - (19/90)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">21 / 110</gadget>
<output>21/110 = around 0.190909</output>

<gadget id="calculator">23 / 132</gadget>
<output>23/132 = around 0.174242</output>

<gadget id="calculator">(21/110) - (23/132)</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">25 / 156</gadget>
<output>25/156 = around 0.160256</output>

<gadget id="calculator">27 / 182</gadget>
<output>27/182 = around 0.148352</output>

<gadget id="calculator">(25/156) - (27/182)</gadget>
<output>1/84 = around 0.011905</output>

<gadget id="calculator">(1/12) + (1/24) + (1/40) + (1/60) + (1/84)</gadget>
<output>5/28 = around 0.178571</output>

<result>5/28 = around 0.178571</result>