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1/2×3+1/3×4+……+1/19×20简便计算?
人气:187 ℃ 时间:2020-04-07 21:31:02
解答
1/(2×3)+1/(3×4)+……+1/(19×20)
=(1/2-1/3)+(1/3-1/4)+……+(1/19-1/20)
=1/2-1/20=9/20
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