a and b represent two numbers, and it is stipulated that a*b=((a+b)/3)3, then 3*(2*7)=how much.
a、b表示两数，规定a*b=((a+b)/3)3那么3*(2*7)=多少．
<gadget id="calculator">2 + 7</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 * (1/3)</gadget>
<output>3</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">6 * (1/3)</gadget>
<output>2</output>

<result>2</result>