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|1/3-1/2|+|1/4-1/3|+...+|1/2010-1/2009|
人气:267 ℃ 时间:2020-06-03 18:11:25
解答
=1/2-1/3+1/3-1/4+1/4-1/5+……+1/2009-1/2010
=1/2-1/2010
=(1005-1)/2010
=1004/2010
=502/1005
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