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初一数学在线解答1/1x2+1/2x3+.+1/2002x2003+1/2003x2004+1/2004x2005
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原式
=1-1/2+1/2-1/3+...1/2002-1/2003+1/2003-1/2004+1/2004-1/2005
=1-1/2005
=2004/2005
=1-1/2+1/2-1/3+...1/2002-1/2003+1/2003-1/2004+1/2004-1/2005
=1-1/2005
=2004/2005
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