It is known that A*B=(A+B)*A, then (2*3)*3=how much.
已知A*B=(A+B)*A，那么(2*3)*3=多少．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>30</result>