Simple calculation; (1-(1/2))*(1-(1/3))*(1-(1/4))*(1-(1/5))*…*(1-(1 /1998))
简便计算；(1-(1/2))*(1-(1/3))*(1-(1/4))*(1-(1/5))*…*(1-(1/1998))
<gadget id="calculator">1 / 1_998</gadget>
<output>1/1_998 = around 0.000501</output>

<result>1/1_998 = around 0.000501</result>