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计算 |1\2008-1\2007| +|1\2007-1\2006|+|1\2006-1\2005|+|1\2005-1\2004|
人气:340 ℃ 时间:2019-08-09 22:23:57
解答
=1/2007-1/2008+1/2006-1/2207+...+1/2004-1/2005
=1/2004-1/2008
=1/1006008
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