If it is stipulated that a△b=a+((ab)/(a+b)), then (2△2)△3=how much.
如果规定，a△b=a+((ab)/(a+b))，则(2△2)△3=多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

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

<gadget id="calculator">9 / 6</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3 + (3/2)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>