A 3-meter-long rope is cut off (1/2), how much is left
一根3米长的绳子截下(1/2)，还剩下多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>