Calculation: (4/15)+(4/35)+(4/63)+(4/99)+(4/11)=how much.
计算：(4/15)+(4/35)+(4/63)+(4/99)+(4/11)=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 11</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">(1/2) - (1/11)</gadget>
<output>9/22 = around 0.409091</output>

<gadget id="calculator">2 * (9/22)</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">(9/11) + (4/11)</gadget>
<output>13/11 = around 1.181818</output>

<result>13/11 = around 1.181818</result>