There is a rectangular flowerbed with a length of 80 meters and a width of 40 meters; there is also a square nursery with a side length of 60 meters. What is the difference in area between the flowerbed and the nursery?
有一块长方形的花圃，长80米，宽40米；还有一个正方形苗圃，边长60米，花圃和苗圃的面积相差多少平方米．
<gadget id="calculator">60 * 60</gadget>
<output>3_600</output>

<gadget id="calculator">80 * 40</gadget>
<output>3_200</output>

<gadget id="calculator">3_600 - 3_200</gadget>
<output>400</output>

<result>400</result>