It is stipulated that A*B=(A+B)*(AB), then (3*2)*4=how much.
规定A*B=(A+B)*(A-B)，那么(3*2)*4=多少．
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">9 * 1</gadget>
<output>9</output>

<result>9</result>