3 (1/5) are ((())/(())).
3个(1/5)是((())/(()))．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 * (1/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>