4.5/0.25-0.75*1.2.
4.5/0.25-0.75*1.2．
<gadget id="calculator">4.5 / 0.25</gadget>
<output>18</output>

<gadget id="calculator">0.75 * 1.2</gadget>
<output>0.9</output>

<gadget id="calculator">18 - 0.9</gadget>
<output>17.1</output>

<result>17.1</result>