If it is stipulated that A*B=AB/(A+B), find the value of (1/2)*(1/3).
如果规定A*B=AB/(A+B)，求(1/2)*(1/3)的值．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (1/3)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(1/3) / (5/6)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) * (2/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>