|2/1-1|+|3/1-2/1|+|4/1-3/1|.+|2010/1-2009/1|
=1-1/2+1/2-1/3+1/3-1/4+.+1/209-1/2010
=1-1/2010
=2009/2010
计算：|2/1-1|+|3/1-2/1|+|4/1-3/1|.+|2010/1-2009/1|?
1个回答
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