1/6+1/12+1/20+1/30+…+1/2005×2006
人气:323 ℃ 时间:2020-04-15 06:30:42
解答
把分母分开
=(1/2-1/3)+(1/3-1/4)+……+(1/2005-1/2006)
=1/2-1/2006
=501/1003
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