计算:|2/1-1|+|3/1-2/1|+|4/1-3/1|.+|2010/1-2009/1|?
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计算:|2/1-1|+|3/1-2/1|+|4/1-3/1|.+|2010/1-2009/1|?
![计算:|2/1-1|+|3/1-2/1|+|4/1-3/1|.+|2010/1-2009/1|?](/uploads/image/z/15987678-6-8.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%7C2%2F1-1%7C%2B%7C3%2F1-2%2F1%7C%2B%7C4%2F1-3%2F1%7C.%2B%7C2010%2F1-2009%2F1%7C%3F)
|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
=1-1/2+1/2-1/3+1/3-1/4+.+1/209-1/2010
=1-1/2010
=2009/2010