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计算:1/(1×2)+1/(2×3)+1/(3×4)+.+1/(2009×1010)
人气:205 ℃ 时间:2020-05-14 12:44:27
解答
=1-1/2+1/2-1/3+1/3-1/4+.+1/2009-1/2010
=1-1/2010
=2009/2010
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