If a 1200-meter-long bamboo fence is used to form a rectangle, one side of which is close to the wall, what is the maximum area of the rectangle?
用1200米长的竹篱笆围成一个长方形，其中一面靠墙，所围成的长方形面积最大是多少公顷？
<gadget id="calculator">1_200 / 3</gadget>
<output>400</output>

<gadget id="calculator">1_200 / 3 / 10_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">400 * (1/25)</gadget>
<output>16</output>

<result>16</result>