(400+100/50)*3.
(400+100/50)*3．
<gadget id="calculator">100 / 50</gadget>
<output>2</output>

<gadget id="calculator">400 + 2</gadget>
<output>402</output>

<gadget id="calculator">402 * 3</gadget>
<output>1_206</output>

<result>1_206</result>