An iron wire is 2 meters long, (1/2) of it is used for the first time, and (1/2) meter is used for the second time, how many meters are left?
一根铁线长2米，第一次用去它的(1/2)，第二次用去(1/2)米，还剩多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

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

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