4.5*1.5+4.5*8.5．
4.5*1.5+4.5*8.5．
<gadget id="calculator">4.5 * 1.5</gadget>
<output>6.75</output>

<gadget id="calculator">4.5 * 8.5</gadget>
<output>38.25</output>

<gadget id="calculator">6.75 + 38.25</gadget>
<output>45</output>

<result>45</result>