Use "△" to represent an operation symbol, and its meaning is: x△y=(1/(xy))+(1/((x+1)(y+1))), then 2△3=how much.
用"△"表示一种运算符号，其含义是：x△y=(1/(xy))+(1/((x+1)(y+1)))，那么2△3=多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/6) + (1/12)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>