If a square nursery covers an area of 1 hectare, the length of each side increases by 100 meters, how many hectares does the area of the nursery increase?
一个占地1公顷的正方形苗圃，边长各增加100米，苗圃的面积增加多少公顷？
<gadget id="calculator">100 + 100</gadget>
<output>200</output>

<gadget id="calculator">200 * 200</gadget>
<output>40_000</output>

<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">40_000 - 10_000</gadget>
<output>30_000</output>

<gadget id="calculator">30_000 / 10_000</gadget>
<output>3</output>

<result>3</result>