Calculation: (5/(2*3*4))+(7/(3*4*5))+(9/(4*5*6))+…+(19/(9*10*11) ).
计算：(5/(2*3*4))+(7/(3*4*5))+(9/(4*5*6))+…+(19/(9*10*11))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">106 / 115</gadget>
<output>106/115 = around 0.921739</output>

<gadget id="calculator">(1/2) * (106/115)</gadget>
<output>53/115 = around 0.46087</output>

<gadget id="calculator">8 / 33</gadget>
<output>8/33 = around 0.242424</output>

<gadget id="calculator">(53/115) + (8/33)</gadget>
<output>2_669/3_795 = around 0.703294</output>

<result>2_669/3_795 = around 0.703294</result>