Calculation: (1/(1*5))+(1/(5*9))+(1/(9*13))+(1/(13*17))+…+(1/(25* 29)).
计算：(1/(1*5))+(1/(5*9))+(1/(9*13))+(1/(13*17))+…+(1/(25*29))．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 29</gadget>
<output>1/29 = around 0.034483</output>

<gadget id="calculator">1 - (1/29)</gadget>
<output>28/29 = around 0.965517</output>

<gadget id="calculator">(1/4) * (28/29)</gadget>
<output>7/29 = around 0.241379</output>

<result>7/29 = around 0.241379</result>