(2/(12*14))+(2/(14*16))+(2/(16*18))+(2/(18*20))+(1/20).
(2/(12*14))+(2/(14*16))+(2/(16*18))+(2/(18*20))+(1/20)．
<gadget id="calculator">12 * 14</gadget>
<output>168</output>

<gadget id="calculator">2 / 168</gadget>
<output>1/84 = around 0.011905</output>

<gadget id="calculator">14 * 16</gadget>
<output>224</output>

<gadget id="calculator">2 / 224</gadget>
<output>1/112 = around 0.008929</output>

<gadget id="calculator">16 * 18</gadget>
<output>288</output>

<gadget id="calculator">2 / 288</gadget>
<output>1/144 = around 0.006944</output>

<gadget id="calculator">18 * 20</gadget>
<output>360</output>

<gadget id="calculator">2 / 360</gadget>
<output>1/180 = around 0.005556</output>

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

<gadget id="calculator">(1/84) + (1/112) + (1/144) + (1/180) + (1/20)</gadget>
<output>1/12 = around 0.083333</output>

<result>1/12 = around 0.083333</result>