(1/(10*11))+(1/(11*12))+(1/(12*13))+…+(1/(23*24))+(1/(24*25) ).
(1/(10*11))+(1/(11*12))+(1/(12*13))+…+(1/(23*24))+(1/(24*25))．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/10) - (1/25)</gadget>
<output>3/50 = around 0.06</output>

<result>3/50 = around 0.06</result>