Specify an operation: a*b=(b+a)*b, then (3*2)*4=how much
规定一种运算：a※b=(b+a)*b，则(3※2)※4=多少
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

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

<gadget id="calculator">10 + 4</gadget>
<output>14</output>

<gadget id="calculator">14 * 4</gadget>
<output>56</output>

<result>56</result>