1/2=1/3+1//6;n=2.其它，1/M=1/2M+1/(2M+1)+1/2M(2M+1).n=3.

来源: wxcfan123 于 2023-03-13 19:56:21 [旧帖] [给我悄悄话] 本文已被阅读：次

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