(270+30*15)/80．
(270+30*15)/80．
<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">270 + 450</gadget>
<output>720</output>

<gadget id="calculator">720 / 80</gadget>
<output>9</output>

<result>9</result>