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1/2+1/6+1/12+1/20+.1/(2005*2006)=?
人气:246 ℃ 时间:2020-04-16 06:59:42
解答
1/2+1/6+1/12+1/20+.1/(2005*2006)
=1-1/2+1/2-1/3+1/3-1/4+……+1/2005-1/2006
=1-1/2006
=2005/2006
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