How many times (1/5) are subtracted from 1 in a row, and the result is 0.
1连续减去多少个(1/5)，结果是0．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>