Calculation: (1/(5*7))+(1/(7*9))+(1/(9*11))+(1/(11*13))+…+(1/(23* 25)) = how much.
计算：(1/(5*7))+(1/(7*9))+(1/(9*11))+(1/(11*13))+…+(1/(23*25))=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) - (1/25)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(1/2) * (4/25)</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>