(15/7)/how much=2.
(15/7)/多少=2．
<gadget id="calculator">15 / 7</gadget>
<output>15/7 = around 2.142857</output>

<gadget id="calculator">(15/7) / 2</gadget>
<output>15/14 = around 1.071429</output>

<result>15/14 = around 1.071429</result>