(1/(2**2-1))+(1/(4**2-1))+(1/(6**2-1))+…+(1/(100**2- 1)).
(1/(2**2-1))+(1/(4**2-1))+(1/(6**2-1))+…+(1/(100**2-1))．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</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">(1/2) * (100/101)</gadget>
<output>50/101 = around 0.49505</output>

<result>50/101 = around 0.49505</result>