For any integer a and b, define an operation: a*b=((b)/((a+1)))*((a)/((b+1))), then 3*5=what ．
对于任意整数a与b，定义一种运算：a*b=((b)/((a+1)))*((a)/((b+1)))，那么3*5=多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(5/4) * (1/2)</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>