If A※B=2A+B, then 4.5※(12※9)=how much.
如果A※B=2A+B，那么4.5※(12※9)=多少．
<gadget id="calculator">4.5 * 2</gadget>
<output>9</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 + 9</gadget>
<output>33</output>

<gadget id="calculator">9 + 33</gadget>
<output>42</output>

<result>42</result>