a*b=2*a+3*b, where a and b represent two natural numbers, then (2*3)*4=how much.
a*b=2*a+3*b，其中a、b表示两个自然数，那么(2*3)*4=多少．
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">26 + 12</gadget>
<output>38</output>

<result>38</result>