2 (1/5), write ((())/(())).
2个(1/5)，写作((())/(()))．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>