The perimeter of the school's rectangular playground is 1000 meters, and its length is 300 meters. What is the area of the playground in hectares?
学校长方形操场的周长是1000米，其中长是300米，操场面积是多少公顷？
<gadget id="calculator">1_000 / 2</gadget>
<output>500</output>

<gadget id="calculator">500 - 300</gadget>
<output>200</output>

<gadget id="calculator">200 / 10_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">300 * (1/50)</gadget>
<output>6</output>

<result>6</result>