1\2004+2\2004+3\2004+……+2003\2004,
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1\2004+2\2004+3\2004+……+2003\2004,
1\2004+2\2004+3\2004+……+2003\2004,
1\2004+2\2004+3\2004+……+2003\2004,
1\2004+2\2004+3\2004+……+2003\2004=(1+2+.+2003)/2004=(1001x2004+1004)/2004=1001+1004/2004=1001.5(约得)
等差数列求和啊。(1+2003)*2003/2/2004=1001.5