A pile of coal, (1/5) of it was removed on the first day, and the same amount was removed on the second day as on the first day. There is still ((())/(())) left in the pile of coal that has not been shipped.
一堆煤，第一天运走它的(1/5)，第二天运走的与第一天同样多，这堆煤还剩下((())/(()))没有运．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>