A rope, cut off (1/4) for the first time, and (2/4) for the first time, what fraction of the rope is left?
一条绳子，第一次剪掉(1/4)，第一次剪掉(2/4)，还剩下这条绳子的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>