解:由公式1/n(n+1)=1/n-1/(n+1)得知,原式=(1/2000-1/2001)+(1/2001-1/2002)+(1/2002-1/2003)+(1/2003-1/2004)+(1/2004-1/2005)+(1/2005-1/2006)+(1/2006-1/2007)+(1/2007-1/2008)=1/2000-1/2008=1/502000
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