55.5+72*0.2-14.4．
55.5+72*0.2-14.4．
<gadget id="calculator">72 * 0.2</gadget>
<output>14.4</output>

<gadget id="calculator">14.4 - 14.4</gadget>
<output>0</output>

<gadget id="calculator">55.5 + 0</gadget>
<output>55.5</output>

<result>55.5</result>