Define a new operation: the law a*b=((a)/(b))-((b)/(a)), then (2*(5*3))+(8/15).
定义新运算：规律a*b=((a)/(b))-((b)/(a))，则(2*(5*3))+(8/15)多少．
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/3) - (3/5)</gadget>
<output>16/15 = around 1.066667</output>

<gadget id="calculator">2 / (16/15)</gadget>
<output>15/8 = around 1.875</output>

<gadget id="calculator">(16/15) / 2</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(15/8) - (8/15)</gadget>
<output>161/120 = around 1.341667</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(161/120) + (8/15)</gadget>
<output>15/8 = around 1.875</output>

<result>15/8 = around 1.875</result>