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1×1/2+1/2×1/3+1/3×1/4+.+1/2008×1/2009的值
人气:121 ℃ 时间:2020-04-05 17:49:22
解答
1×1/2+1/2×1/3+1/3×1/4+.+1/2008×1/2009
=1-1/2+1/2-1/3+^……+1/2008-1/2009
=1-1/2009
=2008/2009
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