Subtract half of it from 1000, then subtract the remaining third, then subtract the remaining quarter, and so on, until the remaining five hundredth, and finally how much is left.
1000减去它的一半，再减去余下的三分之一，再减去余下的四分之一，依此下去，直到余下的五百分之一，最后剩下多少．
<gadget id="calculator">1 / 500</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">1_000 * (1/500)</gadget>
<output>2</output>

<result>2</result>