(3/5) hectare = how many square meters.
(3/5)公顷=多少平方米．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 10_000</gadget>
<output>6_000</output>

<result>6_000</result>