(2/9) is ((())/(())) of (8/15).
(2/9)是(8/15)的((())/(()))．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

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

<gadget id="calculator">(2/9) / (8/15)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>