Use ❈ to represent an operation symbol, if x❈y=(1/(xy))+(1/((x+1)(y+A))), and 2❈1=(7/12), find The value of 3❈1.
用❈表示一种运算符号，如果x❈y=(1/(xy))+(1/((x+1)(y+A)))，且2❈1=(7/12)，求3❈1的值．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/3) + (1/16)</gadget>
<output>19/48 = around 0.395833</output>

<result>19/48 = around 0.395833</result>