问题
解答题
(2004-1)+(2003-2)+(2002-3)+…+(1003-1002)
答案
(2004-1)+(2003-2)+(2002-3)+…+(1003-1002),
=(2004-1002)+(2003-1001)+(2002-1000)+…+(1003-1),
=1002+1002+1002+…+1002,
=1002×1002,
=1004004.
(2004-1)+(2003-2)+(2002-3)+…+(1003-1002)
(2004-1)+(2003-2)+(2002-3)+…+(1003-1002),
=(2004-1002)+(2003-1001)+(2002-1000)+…+(1003-1),
=1002+1002+1002+…+1002,
=1002×1002,
=1004004.