(1+(1/2))(1+(1/4))(1+(1/6))…(1+(1/10))(1-(1/3))(1-( 1/5))...(1-(1/9)).
(1+(1/2))(1+(1/4))(1+(1/6))…(1+(1/10))(1-(1/3))(1-(1/5))…(1-(1/9))．
<gadget id="calculator">11 / 10</gadget>
<output>11/10 = around 1.1</output>

<result>11/10 = around 1.1</result>