(1/5)+(1/45)+(1/117)+(1/221).
(1/5)+(1/45)+(1/117)+(1/221)．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">1 / 117</gadget>
<output>1/117 = around 0.008547</output>

<gadget id="calculator">1 / 221</gadget>
<output>1/221 = around 0.004525</output>

<gadget id="calculator">(1/5) + (1/45) + (1/117) + (1/221)</gadget>
<output>4/17 = around 0.235294</output>

<result>4/17 = around 0.235294</result>