3.5*4.8+2.2*2.4．
3.5*4.8+2.2*2.4．
<gadget id="calculator">3.5 * 4.8</gadget>
<output>16.8</output>

<gadget id="calculator">2.2 * 2.4</gadget>
<output>5.28</output>

<gadget id="calculator">16.8 + 5.28</gadget>
<output>22.08</output>

<result>22.08</result>