Calculation: (((9/20)/((3/4)*((2/5)+(1/3))))/((2/3)+(2/15)+(2/35 )+(2/63))).
计算：(((9/20)/((3/4)*((2/5)+(1/3))))/((2/3)+(2/15)+(2/35)+(2/63)))．
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(9/20) / (11/20)</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">2 * (8/9)</gadget>
<output>16/9 = around 1.777778</output>

<gadget id="calculator">(9/11) / (16/9)</gadget>
<output>81/176 = around 0.460227</output>

<result>81/176 = around 0.460227</result>