Calculation: ((2**2)/(3**2-1))*((4**2)/(5**2-1))*((6**2)/(7** 2-1))*...*((1998**2)/(1999**2-1))=how much.
计算：((2**2)/(3**2-1))*((4**2)/(5**2-1))*((6**2)/(7**2-1))*…*((1998**2)/(1999**2-1))=多少．
<gadget id="calculator">1 / 1_000</gadget>
<output>1/1_000 = around 0.001</output>

<result>1/1_000 = around 0.001</result>