What is the quotient of (9/10) of (9/20) divided by the difference between (4/5) and (1/4)?
(9/20)的(9/10)除(4/5)与(1/4)的差，商是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(4/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/20) * (9/10)</gadget>
<output>81/200 = around 0.405</output>

<gadget id="calculator">(11/20) / (81/200)</gadget>
<output>110/81 = around 1.358025</output>

<result>110/81 = around 1.358025</result>