(1+(1/2))*(1-(1/2))*(1+(1/3))*(1-(1/3))*...*(1+(1/99) )*(1-(1/99)) is equal to.
(1+(1/2))*(1-(1/2))*(1+(1/3))*(1-(1/3))*…*(1+(1/99))*(1-(1/99))等于多少．
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">1 / 99</gadget>
<output>1/99 = around 0.010101</output>

<gadget id="calculator">50 * (1/99)</gadget>
<output>50/99 = around 0.505051</output>

<result>50/99 = around 0.505051</result>