1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+...........+1/2008-1/2009
=1-1/2009
=2008/2009
解:1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+...+1/2008-1/2009
=1-1/2009
=2008/2009
1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+……+1/2008-1/2009
=1-1/2009
=2008/2009
解:1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+...+1/2008-1/2009
=1-1/2009
=2008/2009
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