A rope is 5m long, and if (1/5) is used each time, how many times will it be used up?
一根绳子长5m，每次用去(1/5)，则多少次用完．
<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>