If A*B=48/AB*4, then (4*2)*1=how much.
如果A※B=48/A-B*4，那么(4※2)※1=多少．
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">1 * 4</gadget>
<output>4</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<result>8</result>