Calculation: (1/(19*21))+(1/(21*23))+(1/(23*25))+(1/(25*27))+…(1/(35*37 )).
计算：(1/(19*21))+(1/(21*23))+(1/(23*25))+(1/(25*27))+…(1/(35*37))．
<gadget id="calculator">1 / 19</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">1 / 37</gadget>
<output>1/37 = around 0.027027</output>

<gadget id="calculator">(1/19) - (1/37)</gadget>
<output>18/703 = around 0.025605</output>

<result>18/703 = around 0.025605</result>