Calculation: (1/(5*8))+(1/(8*11))+(1/(11*14))+(1/(14+17))+(1/(17+20) ).
计算：(1/(5*8))+(1/(8*11))+(1/(11*14))+(1/(14+17))+(1/(17+20))．
<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">3 / 40</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">8 * 11</gadget>
<output>88</output>

<gadget id="calculator">3 / 88</gadget>
<output>3/88 = around 0.034091</output>

<gadget id="calculator">11 * 14</gadget>
<output>154</output>

<gadget id="calculator">3 / 154</gadget>
<output>3/154 = around 0.019481</output>

<gadget id="calculator">14 * 17</gadget>
<output>238</output>

<gadget id="calculator">3 / 238</gadget>
<output>3/238 = around 0.012605</output>

<gadget id="calculator">17 * 20</gadget>
<output>340</output>

<gadget id="calculator">3 / 340</gadget>
<output>3/340 = around 0.008824</output>

<gadget id="calculator">(3/40) + (3/88) + (3/154) + (3/238) + (3/340)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) / 3</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>