(2001-1)+(2000-2)+(1999-3)+.+(1002-1000)
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![(2001-1)+(2000-2)+(1999-3)+.+(1002-1000)](/uploads/image/z/142728-24-8.jpg?t=%282001-1%29%2B%282000-2%29%2B%281999-3%29%2B.%2B%281002-1000%29)
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(2001-1)+(2000-2)+(1999-3)+.+(1002-1000)
(2001-1)+(2000-2)+(1999-3)+.+(1002-1000)
(2001-1)+(2000-2)+(1999-3)+.+(1002-1000)
(2001-1)+(2000-2)+(1999-3)+.+(1002-1000)
=(2001-1000)+(2000-999)+(1999-998)+.+(1002-1)
=1001+1001+1001+...+1001
=1001×1000
=1001000.