2乘4分之1加4乘6分之1加6乘8分之1加.98乘100分之1 要简便计算
人气:299 ℃ 时间:2019-11-21 05:48:13
解答
谁出的这么恶心的题,
最后为49-(1+1/2+1/3+……+1/49).最简了.实际是(2N-2)/2N的求和,既1-1/N的和,到98是49个数.
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