2分之一加6分之一加12分之一.
人气:251 ℃ 时间:2020-04-01 14:45:04
解答
1/2+1/6+1/12+...+1/110
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/10-1/11)
=1-1/11
=10/11
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