(1/(1*5))+(1/(5*9))+(1/(9*13))+(1/(13*17))+…+(1/(97*101) ).
(1/(1*5))+(1/(5*9))+(1/(9*13))+(1/(13*17))+…+(1/(97*101))．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 101</gadget>
<output>1/101 = around 0.009901</output>

<gadget id="calculator">1 - (1/101)</gadget>
<output>100/101 = around 0.990099</output>

<gadget id="calculator">(1/4) * (100/101)</gadget>
<output>25/101 = around 0.247525</output>

<result>25/101 = around 0.247525</result>