Arrange the 2010 numbers 1, 2, 3, ..., 2008, 2009, 2010 in a row from small to large. Calculate the average of the last 1011 numbers and the average of the first 999 numbers, and what is the difference between the two averages.
将1，2，3，…，2008，2009，2010这2010个数从小到大排成一列．算出后面1011个数的平均数及前999个数的平均数，这两个平均数的差是多少．
<gadget id="calculator">1_000 + 2_010</gadget>
<output>3_010</output>

<gadget id="calculator">3_010 / 2</gadget>
<output>1_505</output>

<gadget id="calculator">999 + 1</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 2</gadget>
<output>500</output>

<gadget id="calculator">1_505 - 500</gadget>
<output>1_005</output>

<result>1_005</result>