2 meters long iron wire, use up (1/4) meter, how many meters are left
2米长的铁丝，用去(1/4)米，还剩下多少米
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 - (1/4)</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>