Calculate with a simple method: 9.744/2.4+19.7*21.
用简便方法计算：9.744/2.4+19.7*21．
<gadget id="calculator">9.744 / 2.4</gadget>
<output>4.06</output>

<gadget id="calculator">19.7 * 21</gadget>
<output>413.7</output>

<gadget id="calculator">4.06 + 413.7</gadget>
<output>417.76</output>

<result>417.76</result>