Calculate with a simple method: 1/(0.1/0.2)/(0.3/0.4)/(0.5/0.6).
用简便方法计算：1/(0.1/0.2)/(0.3/0.4)/(0.5/0.6)．
<gadget id="calculator">0.1 / 0.2</gadget>
<output>0.5</output>

<gadget id="calculator">0.3 / 0.4</gadget>
<output>0.75</output>

<gadget id="calculator">0.5 / 0.6</gadget>
<output>0.833333</output>

<gadget id="calculator">1 / 0.5 / 0.75 / 0.833333</gadget>
<output>3.200001</output>

<result>3.200001</result>