A 2-meter-long rope, after cutting off (1/2) of it, and then cutting off (1/2) meter, how many meters are left.
一根2米长的绳子，剪去它的(1/2)后，又剪去(1/2)米，还剩下多少米．
<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>

<gadget id="calculator">2 * (1/2)</gadget>
<output>1</output>

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