Calculation: (1/(1*3*5))+(1/(3*5*7))+(1/(5*7*9))+…+(1/(11*13*15) ).
计算：(1/(1*3*5))+(1/(3*5*7))+(1/(5*7*9))+…+(1/(11*13*15))．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">1 - (1/3) - (1/13)</gadget>
<output>23/39 = around 0.589744</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(23/39) + (1/15)</gadget>
<output>128/195 = around 0.65641</output>

<gadget id="calculator">(1/8) * (128/195)</gadget>
<output>16/195 = around 0.082051</output>

<result>16/195 = around 0.082051</result>