A rope, if (1/2) of it is cut off, there are 5.2 meters left; if (1/2) meter is cut off, how many meters are left.
一根绳子，如果剪去它的(1/2)，还剩5.2米；如果剪去(1/2)米，还剩多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">5.2 / (1/2)</gadget>
<output>10.4</output>

<gadget id="calculator">10.4 - (1/2)</gadget>
<output>9.9</output>

<result>9.9</result>